Correct?
No it is irrelevant. Difficulty doesn't affect the time between block changes.
Share difficulty, min pool share difficulty, and block difficulty all have nothing to do with intensity (batch size).
Intensity defines how long the card will run (in hashes) before it ends the batch, drops off results, and picks up new instructions.
You are right (but using wrong words) in that pools pay based on the total difficulty of the shares accepted not the raw number of shares. A miner with lower difficulty will produce more shares but each share is worth less and a miner running at higher difficulty will produce less shares but each share is worth more. As an analogy someone depositing one $100 bill into the register gets no more credit than someone else depositing one hundred $1 bills in the register. This has nothing to do with intensity though.