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Yeah, Ninja actually gets one tier of SB higher than MNK does and has it available for merits. As far as merit pts go subtle blow is negligible since everything dies so quickly.

However as you said for soloing and fighting things that have the potential 1-shot TP moves, SB is certainly nothing to sneeze at. However, I guess since DW is in such limited supply as far as gear goes it serves ninja best overall. SB is more of a survival kinda thing in the long run.