Corić was third the youngest player in top100 in this century after Nadal and Gasquet, and Zverev was close to him in this classification when he was 83 in ATP Ranking one month after his 18s birthday.
Right now, Auger Aliassime has 10 pts in ATP ranking and Rayane Roumane (Canadian has three weeks to be 15yo, Roumane - two months) has 8 pts - Zverev had less points to November 2012 (he was 15y7m) when he played final of futures in Bradenton and Corić had 2 points to may 2013 (he was 16y5m) when he won futures in Britain. They were exceptional juniors, they won junior GS, they were number 1 in ITF rank and when you look on list of the youngest futures winners (there are Nadal, Gasquet, Djoković, Murray, Ancic, Del Potro in top 11) - Zverev had opportunity to be the youngest and Corić is 9th. They were exceptional juniors and they made impressively fast transition to ATP. But in an age of Auger and Rayane, they where nowhere near to their maturity - Auger is the youngest player who ever qualified for ATP Challenger Tour, Roumane beat player from top400 (Yann Marti).
It's brave comparison and it's quite obvious every youngster has different type of growing as a tennis player and teenager. What I want to say, is that we have group of exceptional good teens making very fast transition to ATP level (Rublev, Zverev, Coric - they are the best in terms of this), but both Auger Aliassime and Roumane are right now clearly better then they were. It would be (too) brave statement, but they hopefully may be bigger tier of prospects than this trio above, and that'd mean they are close to be generational type of prospects like Nadal or Gasquet. Their results are SICK - f.e. Zverev in day of his 15's birthday had no points in ATP ranking and was outside top200 in ITF ranking - Auger is one win away of top1000 ATP ranking and he's one win over Withington away of ~870 in ATP ranking.
I have to admit that, yes, that we had some other prospects who made impressive runs as kids like Kozlov (I don't cross him out, but expectations after his challenger final were very high), who then stopped their development. But firstly, results of Aliassime and Roumane are not occasional - Auger made 5-6 impressive results in this season already and Roumane for example won last year very prestigous tournament for 14s in France. And secondly - they'are so impressive in terms of maturity - we know how tall and strong physically Roumane already is and we saw what with Wolmarans Felix did in Drummondville.
Do you remember when 15 yo Gasquet beat some Argentinian journeyman in Monte Carlo? Maybe Aliassime isn't that talented like Richard, but this is the same sort of maturity. Sick versatility and above average technique, in every term extraordinary for a 14 yo kid.