I stand by my comments on smalls generally having lower ceilings.
Generally at 18 they're among the most advanced but 2-3 years down the track at AFL level they tend to get past by, by those taller types who are still growing into their bodies.
With the smalls (sub 180cm types) my view is take them on who they are today. If they are AFL standard as they are now, take them. If not, pass.
Size may limit McGrath's upside somewhat. But given how advanced his game is and given his improvement over the course of the season (which to me suggests further improvement will come - as a variable that leaves some wiggle room within this rule). I think McGrath is a worthwhile bet with any of those top three picks, wherever he happens to land.
I probably don't have McGrath all things said and done being the best in the draft. Maybe a Setterfield, McCluggage or someone else may be. Drew if he gets midfield time? Who knows. McGrath looks exceptional in any case and a worthwhile top selection with those top overall choices rarely the best player in the draft anyway.
Small is ambiguous. I tend to class smalls as sub 180cm. Medium types 180+ of non key position types. And talls 192+ and must be of key position
I promise not to mention Leigh Montagna , who may have taken a long time before peaking in around 2010