Talent is talent. I personally see no difference in adding a top 10 draft talent this year compared to next. The only way this becomes an issue is if the Braves bust on the #9 pick next year and Stewart goes on to be a successful MLB pitcher. Now that certainly can happen but it's a wait and see situation.
IF they hit on the #9 pick next year then everything probably works out ok. BUT, the fact that they MUST sign #9 next year will affect their thinking going into the draft and will likely lead to at least some form of signability pick. OR they could get strung up by whoever they take at #9, causing a need to go signability at #22 or 25, wherever their normal pick falls. And the idea that you "just take a college player at #9" to backfill the miss from this year potentially further handcuffs your ability to draft BPA.
It's not a good look no matter how you slice it.
And, BTW, I wanted Gorman. But, if you go Stewart, you sign Stewart, unless the injury is so bad that he shouldn't have been picked to start with - I know, no physicals, blah, blah but they had scouts watching the kid pitch and no one said "you know, it looks like he's favoring his wrist when he throws".
How much money did the Braves throw at Hursch, Davidson, Sims, Gilmartin, Lipka, Devall, Johnson, etc. etc.
You don't get many chances to draft in the top 10 if you are a good team. When you do you better make the best of it and get talent with a possibility of being more than ML filler.