Duchene isn't much better than Toffoli and he's older, I could see swapping them with LA throwing in a 2nd or a prospect, but I doubt that LA would agree to give up a 1st and Martinez as well.
I think the Tampa would rather have Johnson than Landeskog.

Martinez is LHD but has always played the right side his whole career so idk if he is the defender COL should target. Muzzin would be a better defenseman for them, but it would most like be a player for player swap in Muzzin for Duchene similar to getting Faulk like i've seen on here a lot.