I don't think you can really do MMA math like that to determine who has better Jiu Jitsu.
Oliveira dominated Felder on the ground in the first round of their fight as well. He had his back several times and constantly threatened submissions. Oliveira burned himself out going for the finish in round 1 and didn't have much left in round 2, that seemed to happen to him quite a bit back then but he's improved that part of his game considerably. It was also an elbow on the feet from Felder that clipped Charles started the beginning of the end, it's not like Felder outgrappled Oliveira at all. That narrative is just completely untrue.