If Dak isn't man enough to handle an unintentional snub or business decision snub in the process of a contract negotiation, then he's not man enough to lead the team to a SB. What matters is if he's a Cowboy when the season starts. If not, it sucks but the team will move on with or without him.
Seriously, either it was intentional or not. If it wasn't and he gets butt hurt? He's a baby. If it was intentional, then it's part of the negotiating process (right or wrong). I seriously doubt a hype video that lacks him is going to bother him much if they give him a fair offer. He's already proved that he's all about the money first. (Which is fine, since that's how almost all of today's players are.)