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I would be definitely sticking with Donaldson at #15, he is a good fit there and will serve his Wallaby aspirations well. I can't see him being the Wallaby #10 now, so may as well embrace it.
That said, I'd be seeing Potter on one wing (I think most of his internet highlights are in #11 jersey) and just may (left field I know given his form) see Spink moved out one as a hard running option.
Unless we secure a genuine speedster then I think we are looking at (no particular order)-
a. Tiatia
b. Poolman
c. Spink
d. O’Donnell or
e. Leahy