If Belle is 3711, then underpitching it won't make it turn into 3724 or 3726.
If WB06 is 3638, then underpitching it won't make it turn into 3333 (my favorite weissbier strain).
I haven't found any dry English ale yeast that comes remotely close to giving the stone fruit esters of 1469.
And, I have disagreed with Denny for years on this. As someone who has pitched on top of yeast cakes for years, I can emphatically say that English ale and German weissbier yeast character drops dramatically with later generations. The Belgian yeast, not so much.