Could be, but we should ask the artist first maybe, that is what I've been doing, but I don't want to annoy the artists by asking constantly so either someone else asks for confirmation or we leave it as it is.
Their job is to draw, not answer my questions on twitter. I found out it was Grizzly because I asked the artist if it was Leonine after someone added Leonine to the issue, he told me no it was Grizzly.
It is true his job is to draw, and at least I should say that he draws hahaha, since they do not put it in the comics. in conclusion I do not see why your question will bother you, on the contrary that it feels good because fans enjoy their work.
I mean, I don't mind asking, but I'm constantly asking and when its constant, it might be annoying or not depending on the person personality and the way you ask stuff (I think I'm pretty polite about it).
and in this panel of Marauders Vol 1 3, my theory is Decimus Furius (although I remain in doubt because both horns are in the same direction), Jeremiah Muldoon (Earth-616) aka Meld and Infectia (Josephine) (Earth-616) or Cordelia Frost, what do you think?
I think they are just random characters, just like the bald guy isn't Microbe in my opinion, I've asked the writer/artist two times, but they haven't answered me.
Meld doesn't even look like that besides being green, I doubt they would bring Cordelia to the story just as a background character specially when her sister is essential in this book, I think they are all original drawn by the artist, perhaps even Eosimias.