It is not much appreciated around here, but in his first six seasons Heyward had four seasons with a WAR in excess of 4.5, 3 in excess of 5 and two in excess of 6. I would the thrilled if Acuna did something like that.
From your past comments, I know you see Heyward in a more hazy light than I do, but during those first six years (which are the ones that really matter since after those six years most players get paid market rate) Heyward was a tremendously productive player.
Folks would do well to look at how good Heyward was during his A+/AA/AAA tour as a 19 year old. The 1.066 OPS he posted in AA was on the back of a .360 BABIP...40 points lower than the BABIP Acuna has been rocking for his 1.000 OPS.
Are folks going to say Acuna is faster and hits the ball harder than a young Heyward?
And yes, folks should be doing back flips if Acuna produces 27 WAR over his first 6 years of control like Heyward did.