I just assumed Renly wouldn't tolerate an independent kingdom xD, I wouldn't be surprised if you just ganged up on Greyjoy once he'd done his part for you. Greyjoy is better off allying with Stark or any other independent factions for his own long term safety.
But yeah, keep in mind I am neutral and I am being honest. Lannister will usually lose if faced with the north, south, and Greyjoy, but some skillful leaders have won despite all of that. But thanks to my subbing of Lannister, the Crown has no northern war, and all of their troops are alive except for the minor battle Tyrion lost. Not to mention that the all seeing admin agrees with me
I also think Martell's move put Stannis into very difficult position, and he may now back your enemy. Martell probably should have kept his allegiance secret.
Lastly, I'm also pretty sure Greyjoy has attacked in a way that makes it very easy to counter-attack with the forces that were left in the northwestern Westerlands.
















