I just looked at Vegas' cap situation and they are EXTREMELY close to the line, and I believe they need to unload one more player or take back one player on LTIR if they want to activate Martinez.
Today they are sitting with a $96,524,106 cap hit (per CapFriendly of course).
If they unload Dadonov alone, they would be at $91,524,106 (or $10,524,106 over due to LTIR).
Assuming Martinez is activated, they would then only have Stone and Bischoff on LTIR totalling $10,216,667.
They'd be over by $307,439 as they wouldn't have enough LTIR room to make their current cap hit work.
I mean, they could simply send one of their guys down to the minors I guess. That should free up the space.