Look it is very simple. There is lots of weed flowing up the Yucatan Channel. Where it comes from doesn't matter.
IF the wind blows to the east it screws ups Playa Del Carmen and Cancun and the east side of Cozumel where it might mess with you're margaritas. But it is VERY rare for the wind to blow from the west so your chances of having a messy beach on the prime side of Cozumel is very rare, but it might mess with the fishing lures that get entangled in it offshore.
I'd look forward to nice beaches and diving in Cozumel, and not so much fishing.
Dave Dillehay
Aldora Divers