They are big but I don't think they would have survived very well against the Mig-15. They tried B-29 strikes in Korea and had alot of losses so a larger target would not do much better at such a low speed.

The USAF must have known that too because they tried several types of parasite fighters to be carried in the B-36 bomb bay such as the Goblin and a version of the F-84 but found it too dangerious to recover the aircraft in flight.

I think the B-47 put the B-36 out to pasture in about 10 years of less as well as air to air refueling.

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