Shopping for my dad taught me that that model feet need space up front more than anywhere else. I always check that his toes can spread without the upper pressing down on them and that the shoe bends where his toes bend which and yeah... lighter builds are out there even in that model sizes and so you do not have to accept a clunky feel.
For wet sidewalks, rubber matters more than foam. Look for a tread that has little channels to move water away, and make sure the heel is not slick or shiny. If the stock insole feels mushy, swap to a firmer one so he does not feel unstable. Do a short break in with a few ten minute walks and watch for hot spots. Works great.
