I’ll comment on 1 or 2 of these…
Yes, but that is assuming there is not a lease that is in effect. If a lease is in effect, you’ll want to compare any offers on a net royalty acre basis, since the lease royalty percentage has direct bearing on future cash flows for any new owner. The letter writing squad often uses these terms willy nilly.
No, unless you have contractually promised such - and I’ve never seen that in my 40 yrs. in the business - and moreover, never heard of that, period. I doubt seriously that you would have entered into a lease contract with that kind of language.