Give chase doesn't necessarily mean that the zombie was running. I do believe it was walking quite quickly though, as can be seen in Kenneth's video. And I'm sure he was exploring the mansion for some time because he just couldn't have stayed out in the woods for any decent amount of time with cerberus all over. And Kenneth died right as Alpha Team entered the mansion, which was a day after Bravo smashed down.

Well considering Kenneth did not have any keys he can't have got that far in the mansion. Must have slept in the main hall for a night? Or do you think he might have met up with Richard Aiken or Forest Spyer?

Maybe he spent a lot of time in one area?

Well I kind of think that having all of the doors that were locked was illogical, probably not exactly canon, but was just there for gameplay purposes. I mean the balcony where you find Forest, that door is locked, but obviously Forest got through the door somehow, through osmosis? I don't think so.

Likewise, most of the mansion was probably already explored, and most doors were probably already unlocked.

i always thought that wesker or RQ re-locked the doors

She was present, but I doubt she was in the actual mansion anywhere. I don't think she had access to the locks on the surface areas.

Well it must've been wesker, or something to do with a power outage that reset the locks.

but it iiiiiiiiiis canon..... chris's 'crank' comment in LIN proves it....

I'm sure there was a crank, but it wasn't hidden or anything. It was probably in the tool shed in RE1 and he just picked it up after seeing that he needed one. That's not as bad as the piano fiasco.