@SinnerBoy
The consensus seemed to be that, in order for a pardon to be granted, there must first have been a conviction, or a detailed confession to a specific crime / crimes.
I don't remember that as a consensus as far as Trump/a POTUS being pardoned by a future POTUS, due to the Nixon pardon. Nixon was never convicted of anything nor did he ever admit any wrongdoing (in fact, the opposite). He resigned 'for the good of the Country'. We all know the real reason, but that's what he stated as his reason. He was then 'preemptively' pardoned by Ford for any and all wrong doing. This 'preemptive pardon' was never tested in a court of law. Link below is the actual wording of Nixon's pardon. Trump did preemptive pardons/granted pre-trial clemency for Steve Bannon, Kenneth Curson, and Aviem Sella to name a few. None of these were ever challenged in court. As I say, it's just all uncharted territory.
https://www.fordlibrarymuseum.gov/library/speeches/740061.asp
The main issue that was being debated re Trump IIRC was whether or not a POTUS could pardon himself, whether before or after a conviction. IIRC the consensus on that was that there is something in US law (don't ask me where) stating that 'one cannot serve as their own judge' in a court of law. The issue was, in pardoning himself, would a POTUS 'technically' be serving as a judge. Once again, never been tested in a court of law.
If, God forbid, Trump was to be reelected (spin around three times, spit on the ground, and stomp on it to prevent that from happening), I'm positive that both preemptive pardon and self-pardon WILL be tested!