There are two logical conclusions to this issue. First though, the rule on people that don't post is that if they haven't posted in a while (I use a 3 day rule of thumb) you can start skipping their posts.
That being said, you can either have your character leave the class to do other things, or one of the students in the class can have an NPC substitute teacher come to take things over for the day. Any given champion is capable of running any given class.
I planned on being in the class, but it being lead by Roark instead. I plan on giving Issac an obsession with fossils to cause him to become obsessed and start experimenting and such, being he has a fossil of his own. I can hold off on it until later, though. Mythology can spark the interest. Or maybe Roark can pull Issac from the class. I don't want you to have to go through any unnecessary trouble, though!
You did? I apologize, as today was a bit of a mess. You see, he posted a class list as a sort of WIP without consulting me, and by the time I realized what he'd done it was already the next day and I was playing extreme catch-up to try and put out functional info, and had no time to wait for him to collaborate with me. Thus, I had no help from him and had no idea.
This /is/ a dilemna, because I'm not joking when I say that putting a half-dozen RPers in a small area causes problems. It really does. Everyone has to wait for everyone else to post and with each additional RPer it just gets that much more sluggish. Does this heavily impact your plans? Do you have any suggested solutions or thoughts in mind you might want to go over?
I'm afraid the fossils class is already full. This is the sort of thing you needed to ask when we were asking people if they had a specific class they wanted earlier. Right now I just can't do it. Stuffing 6 RPers in a single class would likely cause issues.