That's precisely my point. For MC, the fact that he viewed Marina means that whatever mutagen he later gains from Evelyn wasn't present at the time he touched Marina. Therefore, a mutagen specific to her power could not have been transferred to Marina from MC.
As for the part I removed:
We don't know the exact mutagen mechanics of her power. The idea that she transfers mutagen to people she touched is therefore 
speculation, unless there's some dialogue I'm forgetting.
Here's what we know, based on available evidence:
- Each night when Evelyn sleeps, she views the full following day of someone and never any other day
 
- That someone is picked from a pool of people she's touched during the proceeding day prior to falling asleep, and only from that pool
 
- If she controls her power, she can pick who she views as she touches them. Otherwise, it's apparently random.
 
- If she touches no one for a day, she sees no one. This also implies she cannot view herself.
 
- What she views can be altered by actions taken to influence it.
 
Now in regards to MC, thus far the cure mechanics of the powers he's gained are the same as the original. The powers he's gained from Moonsong, Emerald, and Kat thus far appear the same, though his control and current power with each is more limited (likely because he's had them for less than a week). Until evidence suggests otherwise, it's reasonable to believe other powers MC gains will function similarly.
Given what what 
know and ignoring
 speculation, it is therefore within the realm of "how Evelyn's power works" for MC to view Marina. We know he touched her earlier in the day. He tried to control the power to view Evelyn, but as they acknowledged, the chance of him being able to control it immediately is not high. I don't think we know for certain that he viewed Marina's next day, but there's no reason to believe otherwise. Therefore, the fact that MC views Marina does not contradict any of the core functionality of Evelyn's power, as we currently understand it.
Is it possible that powers work differently for MC? Sure. But there's not really evidence to suggest it at this time. And I'm the meantime, if the powers 
do work the same way, it suggests that Evelyn probably isn't transferring something to the people she touched either.