I have not and will not name Roshei Yeshiva by name in this forum.
There are many many roshei yeshiva on record who do not think litvishe boys should date at 19 and you know that as well as I do.
As for returning from EY earlier – no way I can prove it until it happens. Suffice it to that many many of the Roshei Yeshiva who signed the letter are very much on board with that idea as well. The implementation of it will not be done by putting letters in the paper – but slowly and surely as Roshei Yeshiva talk to their individual talmidim.