What was Richard Nixon pardoned for? He was only named by the Watergate Grand Jury as an “unindicted co-conspirator.” He had not been tried or convicted of anything.
When a president issues a full pardon, it covers all contingencies. When George H.W. Bush pardoned former Secretary of Defense Caspar Weinberger it was before Mr. Weinberger even had gone on trial in Iran-Contra. The pardon stopped the trial cold.
If Obama was in serious legal jeopardy, he would resign the office (my preferred way to get rid of him) and he would accept a full pardon for any and all crimes that he may have committed from his successor just as Nixon did.
To your #81:
You may think all that stuff—you are welcome to think whatever you like but most of that is simply incorrect.