Quinn met a girl version of him self and frakked her.
But then an evil version of the professor replaced the one they started off with and he just started acting like the regular professor after a awhile and the producers forgot about the switch... Where was I?
The last four episodes of Felicity were not a Gamble.
They were a fuck you.
JJ said "I'm finished! It's all been nice, but can I go home now?"
The suits countered "4 more episodes or we kill your puppy."
They just sprang four episodes on him after he had tied everything off and finalized all his story lines.
That's fucked up.
If he hadn't buckled with Felicity, they wouldn't have been able to prolong Lost so far past it's used by date.