Chapter: 377 (DBZ 183), P8.3-5
Context: as Goku and Gohan start training in the Room of Spirit and Time
Gohan: “Dad, am I going to get in the way of your training?”
Goku: “At first, yeah. But once you’re able to become a Super Saiyan, you’ll really come in handy as a training partner, Gohan. That’s my ideal, anyway. Obviously I intend to obtain power surpassing Super Saiyan. I want to be stronger than anyone, after all. But Gohan, I intend for you to even further surpass me.”
Does this statement implies Gohan was stronger than Base Goku Pre Rosat? Goku saying he wants Gohan to further surpass him strongly implies Gohan has already surpassed him.