Yes, I've seen those recommendations. When they claim it gives an advantage of "good" bacteria over "bad" bacteria, they are referring to medical studies that tried to measure whether there was any statistical advantage for specific known types of "good" bacteria over specific known types of "bad" bacteria.

It is too much to expect that no "bad" bacteria would thrive on resistant starch, so it depends on your existing gut flora whether adding resistant starch would give "good" bacteria an edge or not. Note that Klebsiella is considered a "neutral" gut bacteria by most researchers, so effect on Klebsiella may not even be taken into account at all... let alone other yet undiscovered germs that could contribute to AS[1]. In particular, studies focused on weight loss would likely concentrate on ratios of Firmicutes and Bacteroidetes germs, since those are known to affect weight[2].

Also note that your starting point for diet also helps determine whether adding resistant starch is an improvement... what foods were being replaced by the resistant starches? Replacing a donut with plain baked potato might be a net gain, while replacing low-starch flax bread with plain baked potato would likely be a bad thing for us.

[1] https://commonfund.nih.gov/hmp/overview.aspx
"Within the body of a healthy adult, microbial cells are estimated to outnumber human cells ten to one. This community, however, remains largely unstudied, leaving their influence upon human development, physiology, immunity, and nutrition almost entirely unknown."

[2] https://en.wikipedia.org/wiki/Gut_flora
"The ratio between Firmicutes and Bacteroidetes dynamically reflects the overall weight condition of an individual, shifting towards Bacteroidetes if an obese individual loses weight."

After finding bananas in second place on the resistant starch list I am wondering if because of that they are more likely than almonds to affect someone who has bad gut bacteria.

Something that I was eating was affecting me neurologically, too, because I couldn't type without making a million mistakes. It's a little better today. I think it's like my early warning symptom.

Does anyone else get noticable neurological symptoms?

Klebsiella cannot ferment RS - only simple starches and sugars.

Can you back this up with some data?

BTW, inulin always makes me flare, colon and joints both. I've tried foods containing it and also as a supplement