I'd like to add some pros and cons to this:
214PP can counter a wake up kick if you time it right, so you can guarantee your success. Neat!
Also, you can use it on tech rolling opponents. After a 6H+K, 3KP8PK, 8P, 3P4P, 6PKP setup 214P becomes unholdable.
I didn't say you need to use BT 4K. You...