(1) Neither 4♦ nor 5♦ specifically shows more than two-card support?
(2) 2NT shows 18-22 total points (stated as 18-19 HCP and 22- total points). Why do both 4♦ and 5♦ show fully 22 total points?
(3) The explanation of 5♦ includes both "3- 8421 HCP in S" and "Stop in S". The "Stop in S" part comes from the 2NT bid. Why/how does it get watered down?
PS: It would be nice if I could get these two hands to display side-by-side.

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