Apex Legends: Suggestions to buff Caustic

I think the best change they could give to Caustic is to make his ult his Q on a 30-45 second cooldown, get rid of his traps and make his ult release poison out in an AOE around him at X radius for X seconds, X being whatever is balanced best. He's classified as a tank/defensive character, so why not at least give him a close-range ult that forces people to give up pushing him/his team. Or it can be used for him to flush people out, as well as his Q, his passive then still applies. He lacks mobility and has large hitboxes so it still makes him useful in only close-range situations, so he won't be unbalanced, just a very strong counter to close range legends.

1. It gives extra support to his team
2. It can actually play off of peoples ults. e.g. Bloodhound/Wraith. Instead of right now being almost completely useless