The concussion protocol in cycling will always be an issue (or at least until they introduce a force-measuring mechanism in the helmets). You can‘t do a concussion check without the rider losing time. If you pass concussion protocol but are five minutes down, it‘s just as bad as failing a concussion protocol: Your race is done anyway. In team sports and other spots that are not racing sports, concussion checks are no problem, but in cycling you can‘t just switch your rider back in after he has been examined.
Yes you can. I have already suggested a soolution in stage races. Pre-season all riders do bass line tests to check their cogency. You crash in a stage race with suspected concussion then you travel in the medical car for 15 or 20 minutes and then do the bass line test. Pass the test and you rejoin the race, fail the test and you are out.