Its Summer League people!!!!
Donatas Montiejunas was a Summer League star last year. When it got to the point where he had to play actual NBA teams and go against their defenses and players, Montiejunas suddenly wasn't good enough to play for half the season and when he did, didn't look all that impressive.
That doesn't mean Olynyk goes the same way(though I think he will) but let's temper the expectations based on Summer League. Its not like he is playing against the Chris Boshs, Serge Ibakas, Anderson Varejaos, Kevin Garnetts, LaMarcus Aldridges, Josh Smiths or Tim Duncans of the world.