Yeah, obviously there are players who were already drafted or applied for draft and went undrafted and hence no longer eligible. I think the question was for those that by-passed college, straight out of HS, to play in G League and therefore are legible to be drafted.
Also foreign players that didn't submit names for draft in the past. Common sense shouldn't need to be explained. We all know that veterans now play in the G League.
I already mentioned the top 3 players that are draft eligible, if they so choose, in the OP.