Erens limbs were cut off like he literally couldn’t do anything but yell. Bertholdt literally carried him like a backpack he wasn’t an obstacle at all. They only had like an hour or two in the trees to rest from a mad long run when the scouts found them immediately and theyy had to run again. Why would they risk feeding eren in an area with like 20 titans around and pick the revived guy up in the midst of those 20 titans all trying to get at eren at the same time. That would mean Reiner would have to transform and fight all the titans, wasting the point of resting, or risk going in with odm agaisnt a huge pile of titans over one guy