I personally think it was a situation that we needed to get the best we could while we could... in 12-months the kid will walk, I have no doubt about it. He will play his guts out this season for the Suns, do everything right and tick all the boxes. He will be an extremely valuable commodity and come season's end every Victorian club will have had 12-months to tweak their books and offer him a ridiculous amount of cash he can't refuse, and he will gladly pack his bags with a grin and head home a wealthy teenager to his family and friends.
I'm not sure that this is how it would play out GCSuns. Assume he is a prodigious talent, plays his guts out, and becomes that extremely valuable commodity. If, like you say, every Victorian club start making offers for him, that can only possibly drive the deal upwards for the Suns. Competition for his services is fantastic for us. Look at the Mitch Clark scenario... two clubs in the ballpark, and one essentially had to outbid the other.
I say let's root for him to play brilliantly this year. If he still wants to go, it'll work out just fine for us