I assume you mean Blaine in place of Danny, since Danny only has Showboat cards. ^^
Assuming all four cards are different characters, then play order shouldn't matter. Each Brothers in Arms effect could be activated up to three times.
If you read the rule for the ability, it doesn't activate immediately if I recall correctly. So you do get the 3X for all four abilities no matter how you play them.
Thanks to both of you. Played for the first time yesterday and for some reason I thought that was the case
Follow up question.
There are these "Once per round", can they be used even outside of the phase where you buy and strike?
I think there is a card that cancels a strike card if I remember correctly.
Can I save for after an enemy has hit and see what I get?