Then you fight slower versions of DaD decks that uses Dark Nepthyrs instead as the primary removal engine, only nuking the back row instead of everything. If the community/geeksquad is as casual as you say, then I doubt that we will see Cyber Valley duping trick either.
Without 3 allure which is reasonable because that thing is expensive, I'll try for 2 or 3 Solemn Judgments. If Solemn Judgment is not accessible either or we worry about bad starting hand (which macro ALWAYS do at important matches), then Lightning Vortex, Enemy Controllers and the last DDA are decent follow ups.
Bottomless Traphole becomes a considerable option since they do well against Gladiator Beasts, mirror matches against RFG monarchs, and basically everything but DaD/Dark Return decks/Oppression Gadgets.
We'll have to face:
-gladiator beast: it's reasonably cheap as you can get away with just using 1 Herak and be decently fine. Test Tiger does cost some, but the entire deck together is under 200... Yeah it's still expensive, but RELATIVELY cheap compare to DaD and their allures. Not a very good match-up seeing how DD Scout plane is asking for gladiator beasts to tag out using it. Gladiator Beast is more a reactive deck, and tags out to the appropriate monster to blow up monsters/traps with Murmillo/Bestiari or build towards Heraklinos and backed up by solemn judgment for control. Also lingers around the 1800 atk power each, while if they set anything, it's going to be Hoplomus hoping for you to run into its 2100 defense. Your non-tribute line up at most clashes with them (which is fine), but none of them can get pass hoplomus and some of them like the scout planes are just asking for it. Hopefully monarch's effect can slow down the deck and safely remove the monsters from play, and Thestalos nailing Test Tiger in the hand is the best thing ever. DDA is great here to remove the monsters.
-zombies/gigaplant: both relies on cards in the graveyard, which won't be happening unless gigaplant tries for the OTK, which then hopefully you can get Kycoo out fast enough to stop gigaplant from touching the graveyard if he used future fusion or other methods to load up the graveyard before you got RFG cards out.
-oppression gadgets: if there really is no DaD around, then I recommend Mobius over Thestalos just because of these annoying guys. Oppression is painful, and along with half the deck being the back row (the only deck in today's meta still playing defensive cards), it's difficult to survive the endless trade-offs. The battle is to keep your RFG cards alive (or get them out asap after you lose yours) so you keep getting survivors and scout planes back to live the trade-offs, while you have to kill the Oppression so your survivors aren't useless. Defeat Oppression and there's really nothing they can do against all of your recursion from RFG through survivors, RftDD and DDR.
-Six Samurai: definition of swarm, but most of them only run 1 Kamon and 1 more in sidedeck, and that's the one that attacks face up spells/traps. Will probably have some problems since monarch is by default a slow deck, while they got six samurai united as their draw engine. Nothing but card effects can beat Shien though in this deck. The good thing is likewise, they don't have anything to beat monarchs either except Shien in battle, or suiciding Zanji (but only if another six samurai is also out.) Always check which six samurais they have in their graveyard to help you in making the right choices in Reasoning, if you should call 7 to stop Shien, or call 4 to stop allowing more six samurais on to the field so the other player can special summon the shien in the hand.
-mirror match (RFG Monarch)- eh what else can you do but hopefully play the deck better. Put a heavier emphasis to nail the backrow if you got to choose with Caius in case if the other person got to set the RftDD earlier than you, I guess.
-Light and Darkness Dragon- this thing is back up as a new method to fight against DaD. If you can get out RFG cards fast enough, then they can't rely on the destiny heroes or disc commander as their backbone to get out Light and Darkness Dragon. Keep their tribute fodders dead and the deck falls apart. You have the natural edge here since once again, they are pretty graveyard dependent. (assuming they don't have allure of darkness and only destiny draw, or else they just draw too fast compare to monarchs.)
Still, not playing DaD doesn't mean that Dark Return is dead. Just that they are significantly slower because their removal engine doesn't have a "destroy 3 cards" built it to the same thing. Dark Nepthyrs is most likely the one in 3 since Dark Creator is more expensive than Nepthyrs. While slower and only kills spells/traps itself, Nepthyrs does work with trade-in, so it's not surprising to see some D Hero Plasma/Nepthyr combination to imitate the DAD/Plasma build.