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Why is it you cannot increase a characters attack with a reattached Battle Master during an attack, but you can increase Optimus Prime - Battlefield Legends attack if you flip an action like Leap into Battle? How is this any different to using OPBLs skill to play Quartermaster and attaching a battle masters upgrade before defense flips?

You can use Quartermaster to attach a KOd Battle Master to OPBL. If OPBLs ability results in a weapon being attached to him (for example via Quartermaster), the attack bonus of that weapon will apply because you havent counted attack yet. However, if the weapon gives the character bold, bold will have no affect because youve already flipped battle cards.
Source: Wizards of the Coast (2019-06-07)    【Link to Ruling】
Tags: Optimus Prime, Battlefield Legend, Optimus Prime, Battlefield Legend, Attacking