I honesty think, there is NO 'best player' , i think we're all best players in some way. Diamond dragons doesnt prove were the best player.
Well, you can check my island if you like, the ID is Nikit4123 I think is pretty organized and decorated hope everyone likes it.
OMG rainbowisland she has the most beautiful island i have ever seen. There is also an island - she wants to remain a secret where little dragons pop up above the tower and then diseapear. Thats creativity
There is no "Best" players but a few that I think are say "Elites" are-
Windy Islands (knj00)
Nora (NouraMoh)
Bravo Island (doop01)
Dragonville (DragonTan1)
Terra Nova (Kami365)
ra's world (awsumum)
For the most complete collection, awsummum and norah have all the dragons AFAIK. A few dragons are in the stables
BigBraveDragon
Not sure if that's their storm ID, but they have every dragon epic form! I'm jealous. Every habitat they have that has the 500 gold upgrade to 4 dragons, they have.... I counted it up once it was like $250 worth of upgrades, not to mention all the other gold cost items they have...