I'd be worried about Semin on the team. For the reason, see Pierre McQuire's comment on him:
"This is not a great teammate, I'm telling you right now. Not a good guy to have around your group unless you have unbelievably strong leadership. He's the ultimate coach killer, that's what he is." (source)
The Jets have too many young players to deal with a guy like that. An organization like Detroit might be able to keep him on track but I think it's an unnecessary risk for the Jets. That could also be anti-Russian bias on TSN but I'm just not sure about him. Normally I'd say there's no harm giving him a one or two-year deal to keep him motivated but he was in his contract year last season and still did nothing. LW scoring also isn't a problem here. I wouldn't be pissed off if they signed him though, just nervous.
Pierre is a goof. I'm suprised he was able to put together that insult. I'm not a fan of Pierre or Semin for that matter. Crawford on the otherhand I would consider listening too. Just a thought.