I think Downs is a year behind these three.
Needs to add some weight and a lot more game time.
See him as a regular at Doncaster later this season and next.

Turned 21 last month, which is still very young for a prop in the current game. Some don't bend a defensive line until their late 20s.

The best way I can think of to describe Downs is that the others are trying to make a positive impression on the game and he is trying not to make a negative one. He hasn't done anything wrong, some of his goal line defence against Salford was great. But I'd like to see him try to influence the game more rather than just make up the numbers.