He was a Super Saiyan.
I don't even necessarily think Base Goku was above SSj Gohan-Baby either. Sure, Goku rocked Gohan's world, but he got him during a stun, and the fight would've continued had Baby not interfered. Goku didn't beat him down so badly that he couldn't keep going. If anything, they're on the same level. Obviously SSj Vegeta is a lot stronger than SSj Gohan-Baby.
I disagree. Goku was blocking both of their barrages at the same time with one hand each. His mere aura pushed them both the fuck back and stunned them. Then he laid the smackdown. Also they both got taken out of SSJ after taking those hits, so it's a weird situation.
I disagree. He didn't do anything against the blasts that blew up his house, nor did he stop the one that was intended to kill Pan, which sent both of them to the ground. He easily backhanded Goten's blast, but that's Goten, so it isn't impressive in the slightest. Him fending off both Goten and Gohan's punches is somewhat impressive, but his explosive wave seemed to be more of a defensive maneuver to give himself some space. He only got attacks in when they were both stunned, and even then it only put them out of Super Saiyan; they were still smiling and ready to attack again. Plus, Goku resorted to the Kamehameha rather than simply beating them around again. All signs point to the gap not being hugely significant to me.