Lanefan
Victoria Rules
Don't adjust anything. Your main party should still be able to handle an 8-character encounter even if they're down to 7 characters (and if the system is inflexible enough to make this untrue, that's a system problem). Your lone wolf, on the other hand, very likely can't handle an 8-character encounter by himself should he blunder into one; so if he doesn't run away from it as fast as he can, kill him dead. And if he finds a teleporter or something like that and ends up 150 miles away with no way back...them's the breaks. 
"It's what my character would do" is something I usually DO want to hear from my players, as it tells me they're going to play their characters true to what they are even if it means playing themselves right out of the party.

"It's what my character would do" is something I usually DO want to hear from my players, as it tells me they're going to play their characters true to what they are even if it means playing themselves right out of the party.