The hackle feathers are very pointed around the bottom.@LaFleche what male feathering are you referring to? My eyes can't see everything in a picture, but the saddles look rounded to me.
At OP the feathers in front of the tail on a hen are rounded, but on a cockeral would be pointed. The shine on the tail can be on a pullet ot cockeral.
I've seen slower developing roosters look like this before. 6 months is a really long time, but i've seen one look the same way at a year, it never developed properly and never crowed.