I like you're style. You got the same philosophy as I am. I too mix fish that are not supposed to be mix with other, as that what "they" say. I have mix aba aba knife with my other fish as well as west african lungfish. Not only that I got a lungfish comm together.
If you just got that wolf fish, it is not comfortable in the tank yet. Give it a while and the fishes there that could fit in the wolf fish's mouth will be eaten sooner or later. This is just my opinion and I am not a expert, just a hobbiest.
Those smaller fishes are going to be like feeders.
But, you have had the aimara in the tank for a very short period of time. It has taken weeks , if not months for any of my aimaras to settle in. On top of that you only have a baby aimara, I have watched several of my aimaras go from timid fish who would rather hide than come out for a fight. Overnight I have seen them become murders, put dozens of feeders in their tank where they previously would eat them at their leisure ,they would kill eveything in the tank and not bother with them after that. You fish is not showing aggression at the moment, it is flaring b/c it is scared, you will know when it is showing aggression.
Honestly, I think you have not achieved anything yet, come back after 2 years when the aimara is over 20" and is still living peacefully in a community tank. I will be the first to congratulate you.