I am surprised, again at the lengths people have to go to, to make a simple idea understood. I'll break it down for you since you continually go off topic with comments that have little to no bearing on the issue.
Subbing Ninja isn't used for any offensive abilities as a Samurai. You may get a small boost in Dex, and other than that, it is entirely for the damage mitigation. If you aren't willing to use a damage mitigation tool that is part of your job's abilities, then you aren't doing the job correctly.
I think it is really rather clear here, which was my whole first point, that you're going to be scumbag number one, and stand there to take damage. At no point do you mention you're not able to use third eye. Just that you are going to stand there and get hit. Deliberately. How exactly is that useful?
Bringing Warrior subjob into the discussion. Relevance? None, Seigan is used for damage mitigation, whatever your subjob. Again, not using Seigan and Third eye, is a sign of a bad Samurai. The reuse timers on Hasso and Seigan are such that you can switch between the 2 extremely quickly, just to shorten the recast on Third eye, at which time you can reactivate Hasso. This takes around 2 seconds, if not less to do.Trying to excuse the absence of its use by bringing /war into the equation is frankly weak.