Not a perfect analogy, since Granderson has been a top hitter before, but certainly another example of how much of a difference coaching can make for a player. Granderson is at the age where the adjustments they made make sense - younger hitters can have more moving parts and still succeed, but it gets harder and harder to maintain a loose swing. Chemicals aside, Barry Bonds was the best example of this. And it's probably one of the reasons Griffey Jr. never recaptured his glory days (even for a few years) - he always had a "young guy" swing, which doesn't work for a old guy very often.

Great coaches are another thing that money can buy, and something I expect to take off in the next 10-15 years in MLB - why not have 3-4 hitting coaches tailored to your players? Also, it's a good thing that Jeter has been too stubborn to take similar advice - his swing has always been a great blend of moving parts, but it seems to have become too much for him to manage - I thought he might end up like Molitor (barely any movement at all, all hands/wrists, liners everywhere), and he still might. But that shiny new contract of his looks good for everyone else so far. Of course, the Yankees are still in first place...sigh.

I don't want to be that guy, but why is no one 'asking the question'? 

I guess because he's a Yankee and not a Blue Jay?

I think the biggest reason why there isn't too much talk of chemical assistance is that their bodies have not rapidly or dramatically increased in size.  Most suspected (or confirmed) offenders who suddenly hit with more power bulked up, while both JB and CG could fit in as ballroom dancers (okay, I stole that line from another BB contributor, can't remember who but I was ROTF bc it's so true)....

What I find compelling to watch and rare in JB's approach at the plate, compared to the rest of the Jay's hitters (and most hitters in general) is just how selective he is in choosing what to swing at.  He seems to value every one of his swings like a precious item, only willing to distribute a swing after he's satisfied that the incoming pitch is worthy of his attention and effort.  Anything not up to his gold standard, he regards with disdain, like bad meat or a yappy chihuahua.  This is true even when there's 2 strikes against him.
 
Alternatively the other hitters in the lineup are entirely focused on recognizing the type of pitch and its location, determining if it might be a strike and yikes they better swing at it bc they might not get a better pitch to hit in this at-bat.  They seem to place no value on their swing itself, only on whether the pitch is good or bad.
 
The only hitter I remember that seemed even MORE selective was this dude named Barry something or other....