Third big was actually a more pressing need than depth wing. If a wing injury occurs, they'll either condense the rotation or give spot minutes to Cunningham or Walker. Less than ideal, but viable. If a big injury occurs, they couldn't even meet that modest threshold.
Motiejunas, post injury looked borderline finished a few years ago, but should meet the threshold all the same; at least in comparison to Eubanks. At minimum, if need be, the moment shouldn't be too big for him and he should receive a modi of respect from the officials. He's also got legit center size (though it belies his rebounding and rim protection) and a semblance of ball skills (dribble, pass, shoot).