Quoting: Byrr
Those contracts with that retention would take about 18 mil cap space for Detroit. You've manage to float quite a bit more cap their way than they have available.
Just looking at the numbers and not the value or sensibility
Filppula $3MM
Erne $997.5K
Hronek $714.186K
$4,711,686 out for Detroit
$9,538,611 current cap space for Detroit
Johnson $5MM
Killorn $4.45MM
Sergachev $$
Take the Detroit cap space, add the out going contracts, and they have $14,250,297 in available cap space. Deduct the incoming contracts of Johnson and Killorn, and the remaining cap is $4,800,297, and then there's the possibly LTIR from Zetterberg of $6,083,333, and the Detroit has a possible $10,883,630 to sign Sergachev.
I wouldn't do the deal because the term is just too long, and that's a pretty high cap rebuild team, and all that cap is for just two players. Sergachev is a good player, but the 1st will not be a high first. Johnson and Killorn wont be worth as much when their contracts become easier to trade.
Just my 2 cents
Edit for bad spelling, lol