Yes, so far, Aho has had a single end of season, 3rd place vote. In terms of Mullen getting in (as noted earlier), he had 51-3rd place votes, 30-2nd place votes and 48-1st place votes. Aho's top offensive season so far was a 17th place finish. Mullen played in a higher scoring era, so his 51 goal season, 500+ goals, 1,000+ pts and PPG pace aren't that impressive, but he did finish 7th in scoring one year.
For Aho, I won't say no, because he is still young enough that he could accomplish a bunch of things still, but it's a longshot in my mind. I certainly take his PPG pace now and extend it out 7-8 years as it will surely come down as he gets older.
I really don't think there is much point in talking about him at all in terms of HOF at this point. He's compiled a bit where he's no say far behind the 8-ball, but not enough where it warrants discussion.