I don't see a reason to place Goku any more than 20% above his Boo Arc self, which based on scaling, shouldn't be several times stronger than #18. #16 wins.
I don't have a problem giving this to Gohan. He was fast enough to dodge Dabra, who used his fair share of suprise attacks. Gohan should be able to move around Weighted Cell and cause damage.
Kaioken X4 Goku (Saiyan Saga) vs Battle Damaged Vegeta (after Recoome, no senzu)
Kiwi & Vegeta. If Dodoria & Zarbon can beat Vegeta together with a similar difference in power than I'm sure a more skilled Vegeta with the equally as powerful Kiwi can beat Goku as well.
The Ginyu Force (Barring Ginyu & Guldo) vs. Lord Slug's Henchmen