I'd do it. I love Askarov, but I do think he's a lot more uncertain than many fans here seem to think. Assuming the trade was predicated on the assumption that Nylander was at least "open" to signing for a nice payday in Nashville, anyway. Obviously we couldn't do it just for a rental player if he was totally uninterested. But he's a superstar now, and as long as we're in the running, that's a fair swap.
McDonagh is an "adequate" #4D with character/leadership attributes. But that doesn't really benefit us in Nashville atm with a non-competitive team.
If we add Samsonov, no real problem, we should be able to flip either him or Lankinen elsewhere? They are both valid NHL goalies, even if not starter material? I wouldn't hold up a deal just based on that goalie end of things anyway.