It will be peak. It’s treyarch

I just went back to it for the first time in months after seeing your comment, but I didn't see any difference during the Legion fight. I found it a bit harder than I used to as my armor broke but that was because I was out of practice, I still managed to beat it with around 6 minutes left. Just had the m16, no wonder weapons (though I found that doesn't always make a difference anyway, sometimes I get loads of elites without) and I got lucky with Legions teleports as well. Occasionally Legion will just teleport from corner to corner and you just have to wait for him to move again, but that was always the case.