I don't think Milano, Donato, Sanford, or Connolly make sense for us at all. Sanford and Connolly would struggle in the same way that Ritchie struggled. Not enough skating ability to keep up. Donato and Milano can be decent depth offensive forwards for cheap, but neither are very good in their own end and he doesn't have the offense to make up for it. Same with a guy like Rem Pitlick (except Pitlick had a ridiculous shooting percentage that he likely does not replicate). None are going to help Tavares in the dirty areas either, assuming they are used at 2LW.
ZAR, Raffl, and Motte only make sense for a shutdown line. Unless we are putting Engvall on a more offensive line, then we already have our shutdown line: Engvall - Kampf - NAK. None of them provide any offensive value at all. Johan Larsson, who is not signing with PIT it seems, can also fit in this category as a gritty shutdown guy, but he may have a little bit more offensive value and he can spot at center once in a while.
Steel, Heinen, Rask, Stastny, and Tierney should be on the list, but the list is definitely shrinking and it is definitely not the best.