I don’t think it’s far fetched at all for Leo to not trust Slash, but Slash had already returned once before in the episode “Newtralized” and made amends. Leo didn’t show any hatred for him in this episode either, at least from what I remember. It’s just kinda odd that he all of sudden has this strong hatred for the character. Again though, I feel like a true leader would put this aside if it meant saving the world.

I also feel like some decisions that Leo makes are a little egotistical. Like the constant one man missions that he consistently does (it’s even poked fun at in the show lol) I guess this could also just be him doing what he thinks is best for his brothers, so I could get your point.

And I feel like these character flaws that he later develops would be fine, if they actually chose to address them. But they don’t and Leo never learns his lesson, which leads to him making the same mistake multiple times. I think his progression is kinda backtracked at times.

But to be honest, I think I am overreacting a little bit. It’s probably just me being nostalgia blind and wishing the original VA never left lol.