ESB Yoda really wasn't able to do much, he was far past his physical prime. His connection to the Force wouldn't have been affected much, but his augmentation might not make up for his quickly deteriorating physique. The Inquisitors stand a legitimate chance against a vastly post-prime Yoda without a lightsaber. I suppose Yoda could win by virtue of his far more powerful Force connection and just rag-doll the **** out of them, but I'm not sure what scenario is more likely between the latter and the Inquisitors killing Yoda.