Straight from the current CBA:
Before any Player that has suffered a concussion is permitted to return to play in any game, regardless of whether the Player was previously placed on an IL for such injury, the Club must submit a “Return to Play” form and the supporting certifications and doc ument referenced below, to MLB’s Medical Director and the Play ers Association, and the Players Association must confirm receipt in writing (which it will do promptly). The Return to Play Form, a copy of which is attached hereto as Exhibit D, must contain the following certifications by the Club Physician and the ATC:
(i) all symptoms have resolved; (check)
(ii) ImPACT testing has returned to range of baseline; (must have or he wouldnt have been allowed to start baseball activities)
(iii) the Player experienced no symptoms with exertion and baseball-related activities; (check - according to what the Jays are saying)
(iv) the SCAT5 is within normal limits; and (also check or the Jays wouldnt have submitted a clearance request)
(v) the Club Physician has cleared the Player to participate in baseball activities. (clearly a check)
The Return to Play form must also be accompanied by the documentation supporting these cer tifications, including, but not limited to, copies of all ImPACT and SCAT5 tests (including the SCAT5 from the time of injury), the current neurocognitive test score, the baseline neurocognitive test scores, and any reports by the Club Physician and the ATC. If the Medical Director or the MLBPA expert questions whether the Player should be returned to play, they shall consult with each other as well as one of the outside experts on the Committee prior to making a decision. In addition, the Medical Director may direct the Club to have the Player evaluated by an MLB-approved MTBI specialist in the Club’s home city before the Player is permitted to return to play. In the event the Medical Director and the MLBPA expert are unable to agree on the Player’s return to play, they shall refer the matter to an independent expert selected by the Parties, who will determine in his sole discretion whether the Player should return to play.
Gonna go out on a limb and guess that's why Springer is back in Toronto.
Also for reference: ImPACT testing is a crucial component of concussion management protocols, particularly in sports and educational settings. It helps in the early diagnosis and management of concussions by providing a standardized assessment of cognitive function. The test is administered online and typically takes about 25-30 minutes to complete. It includes various tasks designed to assess cognitive abilities that can be impacted by a concussion, such as visual and verbal memory, reaction time, and processing speed.