Seeing more of Lady Danbury in the Bridgerton (and Bridgertonverse) books just makes the creative choice to have her adopt Simon in the adaptation even more ingenious and extremely in character!
Also, they'd better have Simon and Gareth know each other and have an older/younger brother dynamic by the time season 7 rolls around (yea, I am that confident) because I can't wait to see the two of them interact.
(And I definitely wouldn't object to seeing Simon interact with Lady D’s great-great nephew Marcus Holroyd or her other surrogate son James Sidwell. Seriously it's too bloody easy to have Marcus and Honoria and/or James and Lizzie make an appearance.)