As mentioned a think a zillion times there's no reason for a Kensai to go above level 12 on fighter.
In order to compete the Fighter Capstone would have to make up for . . .
- 1 added crti multiplier on 19-20
- 25% incorporeal
- 25% dodge
- About 65 PRR just from Earth-Stance and Defensive strikes . . . with NO OFFENSIVE LOSS to a THFer.
I'm sorry, 10% double-strike just doesn't cut it.
Devs on Lamania stated they like tough decisions . . . this ain't a tough decision at all. The advantage of splashing 6 monk are a no brainer for anything except a flavor toon (aka . . . "gimp").
You've upped the ante on the splash benefits, now it's time to up the ante on the captsone. What that'll be I have no idea. Maybe +5 action boosts and +10 tactics DCs along with the 10% double-strike and this might be useful.