My two cents....
TB has 9 forwards of which they can only protect 7. They may move 1 of these forwards for exempt players or draft picks. One likely would be Filppula sent off to another team or to Vegas. His cap space likely can cover raises for the forwards who are resigned in 2017.
Callhan's cap space when it ends likely can be used for Kucherov or Drouin.
Filppula could be sent to Vegas with other prospects/picks.
In 2017 they will have about $18M+ cap raise for:
$5M to sign 2016 RFAs/roster spots filled
unload filppula (-$5M)
Johnson ($6)
Palat ($5M)
backup goalie ($1M)
2 younger Dmen (combined $3M)
total added salary is $15M
Getting tired of these conversations but this is likely what will happen. Instead could see Killorn or Namestnikov moved at expansion, Filppula moved maybe at the trade deadline? With Point about to break the NHL soon, it makes sense if we lose those two centers. Will still have Stamkos and Johnson at the 1C and 2C positions. I Don't see Drouin getting around a 6 and 6 deal after only one full NHL season. He'll get a bridge around 4 million. He needs a couple of full NHL seasons under his belt before getting that larger contract. Kucherov should be getting a big contract now. He has paid his dues, overpaid them. Which is why he is likely not signed yet.
Yzerman has bridged Vasy and will likely bridge Drouin and etc, so in 3 years , (well 4 years from now), when they are all due raises, Tampa will have contracts falling off, so Yzerman knows what he is doing. imo. Have Faith.