Let me start by saying that I really think it unlikely that he loses today. These kinds of preliminary injunctions have habitually been granted in comparable circumstances (including Brady II and the PI that Zeke himself obtained when this was still being pursued in Texas). Failla went off the reserve in refusing to grant the PI in my professional opinion.
But if he were to lose, he'd serve the suspension. If he wins the appeal and gets the arbitration ruling vacated (a tougher hill to climb than getting the PI in the first place) before the suspension runs its course, say after 4 weeks as you suggest, he won't have to serve the remaining games. But there's nothing to be done about the games he'll have already served, other than sue the league for damages (including lost salary) as dogberry suggests in the post directly below yours.