Things could change, but once again this is advertised for the pre-show. If I remember correctly, the match was also advertised for the pre-show, but it was ultimately moved to the main card.
The reason last year was likely to give bigger spots to Baron Corbin and Shaq. Corbin winning his debut on the pre-show wouldn't have been a very big thing.
This year we have a list of 30 confirmed names. This could change, and nothing says that an NXT name couldn't be added though it seems unlikely, that A) they'll have two NXT debuts and wins in consecutive years, or B) have that person win or lose on the pre-show.
Where are Luke Harper, Finn Balor or Samoa Joe? Harper is most likely getting involved with Orton vs Wyatt, and Joe most likely involved with Rollins vs HHH. I'm not saying it's good, but that has to be the logic. Balor we see the Raw after Mania.
This is a battle of the jobbers, and the winner has three for three gone on to a fairly lacklustre path following their win of the Andre battle. Cesaro jobbed for months, Show laid down for Reigns then vanished, Corbin beat up Kalisto for a while and didn't do a whole lot else.
This year the winner seems pre-determined to be Braun Strowman, likely with Big Show being the last man. Show has been involved in every one of these matches and has won it once (he had to). Sami Zayn is the only other notable name in the match.
Strowman makes sense, but it seems like going through the motions. If Balor was to return here, or if Joe were involved, or even the loser of Nakamura vs Roode - this match wouldn't be on the pre-show.
They're going to go through the motions for Strowman or have Sami Zayn pull the old David routine. Whoever wins, they need to push the damn guy.
The Andre battle royal trophy has done little other to formalize the write off battle royal that WrestleMania was having almost every year anyway. Let's not hate on the fact that this match allows multiple guys the chance to perform at WrestleMania that might have been sitting in the back.
Corbin doing nothing was lame, though he did get time to build his character. Cesaro staying heel and jobbing out was lame, but we got Kidd/Cesaro from the fallout and that was pretty cool (rip Kidd's neck).
I don't think that this match has to be on the main card, but the win has to start to really mean something. If it's Strowman or Zayn - put a midcard title on them asap. Let them have a good long US title reign or maybe IC if they wind up on Smackdown. Otherwise this battle is just of seeming non-prestigious with the most prestigious name. Andre's name deserves better and the winners of this match deserve stronger booking.