I wouldn’t bank on any pitchers till they have a few years track record in the majors.
And at that point you have to pay an arm and a leg to acquire them. Hence why you try to have as much depth as possible to get that you need as many quality prospects to give you the best odds. What the Braves poster is offering isnt quantity per se, i would say it is quality and quantity. Three top 100 pitching prospects (all who might be MLB ready) isnt anything to blink at is something when we only have 1 maybe 2 and they are so far away from the majors in Pearson and Pardinho.
Espcially considering next time you are contending you are either in Stroman's last year or his contract expired by then. I wouldnt be opposed to trading anyone off our current roster for the right deal.