I'm bored

[Man of Means]

Preflop, flop, turn look super standard - passive players call more than they bluff/bet.

On the river we should note that A9, A8, A5, A3, A2 just "got there" and this is a heads-up blind battle (+ shorthanded to begin with?)
Do these weaker aces make up a large enough portion of his raising range? Has villain raised weakish rivered top pairs in similar situations or does he tend to just call?

Advocating for check/call:
If you check river, will he usually value bet a weaker ace or lower two pair?