Nah. Is Freshly Picked: Tingle's Rosy Rupeeland really canon?
And also:

• The "Subrosians" aren't called Subrosians in the game, are they? Is there any canon evidence that they are the same, except some very obvious appearance similarities? And also, the "Subrosians" can have helped heroes more than once, right?
• This whole island thing again... Why can't there be oceans outside the adult timeline?
• Is the world that FPTRR takes place in Hyrule?

I don't find this any good evidence to outweigh the appearance of Twinrova.