That one pad is slightly "ahead" of the other is not in its self a problem. Lots of calipers have this whether intended or from some insult the caliper saw (like in the front when the fork/bars swing around so far and forcibly that the caliper's cable casing stop/adjuster arm hits the down tube and gets bent. This bending can bring the other branch of that arm, the pad holding portion, along with it. Not common with nice short reach calipers but can happen. Sometimes I can point out the paint damage on the down tube to the customer as proof of my theory.

Sometimes this pad arrangement can be from the central pivot being so loose/sloppy that the arms flop about. But this usually is easy to see and feel for.

How do the rear pads align WRT each other?

It's hard to tell completely but is the front wheel centered in the fork? Andy.