MSI Seahawk with waterblock will not be better than EVGA GTX1080 Hybrid or EVGA GTX1080 Classified with waterblock,
From other side Seahawk with AIO have only one 8pin connector and it's much better when you have one more 8 pin with additional 150W just in case.
Maybe for some custom BIOS, maybe someone want to train on LN2 on older cards for 2-3 years and could use better cards with 8+8pin on PCB.
8+8pin is enough even for default power consumption 250W. I don't like when hardware come close to limitation. It's much better when no way to reach limitation in any scenario. Than I feel much better... I always connect and second 8pin on motherboard even if mobo work with single. Even with CPU less than 100W power consumption. :). Same is with graphic card 8+8pin is some minimum for me. OK I accept it's little funny 8+8+6 pin on GTX1080 that's for stronger Pascal, but 8+8 pin is proper.
MSI GTX1080 Sea Hawk is one of nicest MSI card, and they made some nice graphics with closed shroud... But far from Hybrid.
Hybrid is... Imagine Rampage V 10TH Edition, I saw with KLEVV Crass... pain for heart so much elegance... only miss two EVGA 1080 Hybrid in reinforced slots locked with switch for SLI configuration.