A significant advantage. There is no reason to summon your Primeval first. In fact, it’s MUCH more often than not worse to do so. The team that summons first gets significantly less invasions and has to deal with the blockers. With Taken goblin blockers shielding the Primeval and envoys.
If a team summons theirs when the other team has less than 30 motes, it should be a shoe-in. Chances are though that it will actually cost you the match. You’ll spend the majority of the time just having your Primeval healed until the other team summons theirs and then it literally only takes a single enemy invasion where they get a couple of kills and you’ve already lost. This is especially worse on Emerald Coast because that map is WAY too small.
Gambit is broken. Prime is better but still broken because of this. I’ve said this since the original Gambit first dropped. BOTH team’s Primevals should arrive at the same time and the team responsible for summoning them should get an advantage for doing so. That’s how it needs to be arranged.
Trying to rank up once you hit Legend is excruciating because of how broken this is.
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I stopped taking Gambit as a fun mode once people started using things like Sleeper and bad teams started popping up. Only do it for the powerful rewards and calus bounty, that's it. Not very enjoyable otherwise, and just too frustrating.