Honestly I don't know. Maybe someone can tell us!
Likely that tree would be just fine left in that pot for as long as a couple more years. It is just that the roots will have become a bit of an ugly mess by then. So, not to worry; but it would be a good idea to get it into a wider container of substrate next year and start developing the nebari and root pad along with continuing to develop its trunk line.
Exactly my plan. I'm just going to let it grow wild for a year or two. The soil it's in is very compacted and doesn't seem to absorb water well, which is why I wanted to repot it sooner than later, but it seems healthy enough to wait 'till spring.
Definitely not. Deshojo doesn't have thin new leaves and they're glossy.
