Boxall played as a DM with the ability to drop into the backline at ACFC when he's a youngster - this would be a massive step up but wirth a shot in pre season. Distribution would be my main worry
So did Sigmund. Best player in the league when he did. Still don't think I'd try him there in the A-League.
As for Krishna. It's not just the Phoenix but also MLS clubs, US-League clubs and at least two other A-League clubs.