101,
Falkingham has 2 years of age on May & Reynolds and the other boys you have mentioned.
At 17, I'm sure Falkingham was playing at a level higher than those boys have been playing at. That's no disrespect to those boys or ourselves. He's come from a better level. The kids you have mentioned haven't really done anything to deserve that they should be playing.
If they were ready for the first team week in week out, then Del would have them in there. He obviously feels like they aren't at a level capable enough yet.