It's hard to have sympathy for Dragon when he sits all day on his ass and let's his subordinates handle everything. At least Akainu can rely on other admirals. Who can Dragon rely on? Ivankov who was already imprisoned in Impel Down? Kuma who had been enslaved his entire life and being cucked by a Celestial Dragon? The other commanders are also too weak to make a huge difference.
He can only properly rely on Sabo but at this point, he can give up his position and give it to Sabo. Sabo contributed far more to the Revos than Dragon ever did.