The comparison is because there aren't many 5-6 150 pound players that become really good major leaguers so you point to the best ones (altuve, Ped) and hope Albies can get to that level.
And there aren't many guys that size who are ever ranked as highly as Albies is now. Pedroia and Altuve both never even came close.
So the fact that so many people do rate Albies that highly tells me they believe he will become one of the few guys that size who do make it.
But saying, 'Few guys that size ever get to that level' as a support for the argument that Albies isn't close to the prospect that Freeman was doesn't hold water.