I agree. Although, I think that might have been the intention on the writers' part to show the characters growing and getting more mature. I always saw Margaret as mostly just a crush and not meant to last. CJ was probably his first really serious relationship.
Same here, honestly.
I remember that reveal really made me roll my eyes when it first aired. It was a bit disappointing to me, because it felt like they made you get attached to this character over time only to find out that he was actually completely different. Sometimes plots twists like this work, but I dunno. For me it felt too out of nowhere for a recurring character.
To an extent, I would disagree on that, only because I feel like there were some foreshadows (which is debatable).
But anyway:
There was one point Thomas asks Muscle Man how he knows where he lives - probably worried that his cover might have been blown (plus, I always wondered how Muscle Man could have known where his "college" was when he was sleep fighting).
Then there was one time Thomas asked if he had to be involved with taking down the other employees to get the World's Best Boss mug for Benson, and with his knowledge of Kung Fu and taking down bad guys, again, he probably didn't want to blow his cover.
Another instance is in "Wall Buddy" when he becomes super excited to watch "Carter and Briggs bust Russia." (His home country).
And of course, the episode Thomas Fights Back but that one is self explanatory.
It also kind of made sense with how quiet he was. The episode had kind of a "never trust the quiet ones." Move.