Looking at the kensei ability Path of the Kensei (Unearthed Arcana: Monk):
If you make an unarmed strike as part of the Attack action on your turn and are holding a kensei weapon, you can use that weapon to defend yourself. You gain a +2 bonus to AC until the start of your next turn while you are not incapacitated and the weapon is in your hand.
Does this mean a kensei with the Extra Attack ability can take an Attack action, attack once with a kensei weapon and then once unarmed and gain the +2 AC bonus for holding a kensei weapon?
Or have I missed something?
(I am stating that the Kensei is playtest material and not official 5e rules so that does not need to be a part of any answer)
(Just a note to say the rules mean the monk can't make a bonus unarmed attack because they are holding a non-monk weapon (even though it is a kensei weapon), but they can flurry of blows as that just requires an Attack option and has no weapon limitations)