I'm fine with Javonte. Seems like he has an NBA level of physical ability, not clear he has a position offensively, not sure how good he is at team defense.
But with a 15th man you really just want a guy who can come in during garbage time and maintain energy, or a guy who can play spot minutes in case of injury and add something to the mix despite whatever major flaws he has.
Javonte seems like he could be that kind of guy, which is fine.
From an upside perspective he could be better than Semi Ojeleye, if he turns out to be a competent team defender.