Samurai - Kaiten Issue

[Shurrikhan]

Just make Kaiten unavailable while the Kaiten buff is already present, as has been requested since 4.0...

Samurai is only really bloated by skills like Third Eye being separate from Seigan/Merciful Eyes, Shoha being separate from Meditation, and, as per most ShB jobs, needless AoE/ST ability equivalents (in our case, Guren/Senei).

There's not a single situation in this game where it's worth using Senei over Guren on even 2 targets, so why do we have two separate buttons for a non-decision? Don't get wrong -- I'd prefer that there were such a reason, but there just isn't, and aside from maybe the Zu fight in Pharos Sirius, there never has been. So why isn't Senei just a vs. sole-target or vs. first-target upgrade to Guren?

Edit: That being said, I'm pretty sure TG was a GCD previously as well. Although the delay is more noticeable without the cast-time, I see no reason to suddenly make it an oGCD. If I'm misremembering and it was already an oGCD but with a cast time, like HW-era Empyreal Arrow, then simply reducing it to a half-GCD should be sufficient.