My guess would be no. But do I think it's possible, yes I do. I don't think it would be $13x5, I think it would be $13Mx7. I could also see a 11.5Mx5 offer sheet.
My gut says Leafs will just match, so teams will be hesitant to bother with an OS against the Leafs. That said, I could see a team like Montreal think I'll put in a big OS on Marner. If we get him, great. If we don't, it hurts the leafs chances of improving their team and it likely makes Kap or AJ available and then I can OS them and only pay a 2nd round pick.
More than all that, I think Aho is most in danger because the owner is cheap.