MC just returned from an involuntary training regime and still didn't have the chance to show their result.
The fight with Cole will be that, mixing it up with an evolution isn't really something I came to expect from WW.
Besides Cole evolved quite recently, and fighting against MC shouldn't be too much emotionally heavy for him to trigger an early evolution. The only case I can see Cole evolving mid-fight is if Thanos returns mid-fight and it turns into a royal rumble of MC vs Cole vs Thanos, because he seems to have a lot of baggage there.