I agree that Madam Foster probably didn't know they were bad at the beginning; her actions were merely a reaction to Moose's appearance. She most likely didn't believe they were bad until the very end, as you stated.
As for the second point, I both agree and disagree. I don't think he may have had it planned out from the get-go, and that things may have occured differently if it wasn't for the fact that he was stuffed in another closet, but I feel that an attempt by him to somehow screw Madam Foster and the inhabitants of the house would've been inevitable. Whether or not it would've been the same plan we saw him concoct in this episode or something entirely different, I have no idea of knowing, but I think his nature would almost demand it. He's a shyster and, on top of that, a shyster who obviously believes he has the right to be in command over everything in front of him and to gain some kind of benefit from it (one of the initial signs of this being the fact that he got Moose to refer to him as "Mr. President" after only what would seem like a day in that closet together). He may not have gone to the length he went to in this episode, but an eventual confrontation would almost certainly happen.
That rambling done, however, I do agree with you that he probably didn't have his whole plan scoped out immediately after arriving at Foster's; he just did it after he felt that he wasn't being given what he thought was his/what he deserved, and was merely stuffed into another closet. That's my opinion anyway
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