Of course, I would doubt myself, had I read this. But if there is a hero Gandalf one day and he combos very well with hero Elrond, you may mark these words as not spoken out of jest. And of course, 4/4/4 is too much for a hero.
Sooo.. perhaps our Potential Gandalf allows for playing attachment and/or events out of any sphere, whereas Elrond allows for the same with allies. Then together they could rule an all-colours deck, basically. That would be interesting. It is just that their joint threat would perhaps be sky-high.
And the second possibility to read your words: since Elrond is Lore plus Spirit with Nenya, perhaps Gandalf is Leadership plus his rings grants him tactics (or the other way).
It is fun to guess, even if it is all BS.