If your root ball fell apart like I've had root balls fall apart, you should be fine. Maybe give it a little extra water and shake the pot around to settle the soil instead of tamping. If it is not too late, bury the plants about an inch deeper than they were in the previous pot, if space allows. Do not let leaves touch your medium.
A week or less in the gallon pot gave you almost nothing. Really, if you want to go the transplant route, just go from Solo to final pot. You can avoid things like root balls falling apart.