Yes, but those that get left out under this system are ones that have committed themselves to the club, possibly when they've had offers elsewhere. Tommy Haughey's article in the YEP a while ago made it clear that it has a big effect on squad morale, with team spirit/bonding being knocked for 6 when outsiders were brought in, usually at short notice, to replace players who had performed well in the previous game.
And the coach of which team are you referring to?
Does that not also occur when clubs take players on loan for a month at a time? Some teams have 3 and 4 loan players taking the place of the clubs own players so that argument isn't solely down to DR. The latest DR team Barrow have been playing with 3 or 4 loanees from Leigh and 1 from Warrington. I suppose it just depends on what your views on DR are for the answer you give.