Well I also recently saw Boston fans ready to trade Carlo and Coyle on the main board in the comments, although that was a few weeks ago, Boston is winning more now and I don't see a trade with them anytime soon.
This is just a trade for luck, maybe Frost will work out, maybe not. Something like a trade for Jost, but we will also hope that Frost will be 2C for us, the chances seem not so high, so I agree with you.
Zegras looks like for me the best from potentially available optionsfor me, he has talent and creativity, he is a good playmaker, as far as I know he plays on the wing and Ducks fans say that is not his position, he is not very strong near the boards and would be better off playing center. Also Ducks fans hate their coach, just like we hated Krueger. We have players who can do some of his dirty work for him, but also benefit from playing with him and his passes. Moreover, Adams had already shown some interest in Zegras.
I would take a risk with Zegras than with Granlund. Because what incentive does Grier have to trade Granlund now? He will simply tell Adams give me Kulich +1st, for rental, Adams will of course refuse. Zegras has control and I think he will fit well into the team.
I agree you want a more proven option, but who? What team is willing to trade their top 6 C to Buffalo right now? I just don't see many realistic options.