L.O.
With my 2 kids I have found that sleep and nap schedules are very different..
My daughter took 2 naps a day until 19 months-- and she needs every minute of her sleep or she is crabby.
My son dropped his morning nap at 9 months and he manages just fine.
I would rock the baby if that is what it takes.. gradually try to get him drowsy but awake and put him in bed. he is still a young baby.
I have never let mine cry it out for more than a couple of minutes.. Every once in a while one of them will cry in their bed and I will go back and hold and rock them.. I will do this for up to 3 nights.. usually by then they are fine and go to bed nicely.