Considering how shocked even Cell was at Gohan oneshotting the Cell Juniors, I'd heavily doubt Goku could oneshot them regardless of what factor Gohan's personality may have played into those reactions. Since this is slightly more than facing multiple Vegetas/Trunks at the time and they weren't implied to be people Galu could just sweep through, as well as the Super manga showing Goten not being able to instantly defeat 3 of them, I don't see Goku getting through more than 3 at once without a Shunkan Ido Kamehameha that would leave him too drained for the rest. If it's a gauntlet style battle though, he has the potential to solo through his superior skill if he conserves his stamina well, though odds are he'd tap out after maybe 4 or 5.