Actually Tampa doesn’t really develop a lot of pitching prospects internally. On their current roster, McClanahan, Taj Bradley and Yonny Chirinos came up through the ranks. Maybe a lesser bullpen arm. But nearly all the remaining ones were acquired via trade or minor league free agency/waiver claims out of other organizations. They acquired Jason Adam, Beeks, Faucher, Pache, Fairbanks, Rasmussen, Kevin Kelly, Trevor Kelley, Jeffrey Springs, etc.
In fact from these names, Boston (Beeks, Kelley) drafted as many Rays pitchers (McClanahan, Bradley) as the Rays did. Of course I probably left off a RP from the Tampa system who to date has minimal playing time.
Also Bloom hasn’t drafted any MLB pitchers yet, but he also only started drafting 3 years ago, so this isn’t too surprising. Shane Drohan was drafted in 2020 and has already reached AAA, which is encouraging…