I get the feeling is they are a little less concerned about rushing Mejia due to his already having half a season in the MLB and if the Pen needs help both him and Beato are probably the best options to go to in the Minors.

I prefer they don’t give up on trying him as a starter as it’s better to shoot for the higher ceiling and return.
But I can see where they might ease him back by putting him in the pen of the MLB squad let him pitch some innings but not too many to overtax him, then give him a full offseason of rest then get him ready as a starter next spring and let him fight for a rotation spot. Then if he fails at that you can decide if his destiny is best served in the pen.
Harvey Familia will also be fighting for spots next spring and the list of potential rotation guys are:
Santana (Lock)
Dickey (Lock if the option is renewed and likly will be)
Niese (I think a lock due to his extention but a bad season could change some minds here)
Harvey
Familia
Gee
Mejia

Thats 7 guys for 5 rotation spots and whoever doesn’t make it is likely put in the pen or traded.
And I’m fine with that if Mejia is one of them because he was beaten out by the others.

That said I would not expect them to make a decision to promote Mejia to the MLB until after the trading deadline and then only if we are still fighting for a playoff and need the pen help.

Not sure I like that decision but perhaps it will just be for this year as he comes back from the surgery and they will start fresh next year in ST.