Re: just one diaper
Your next baby may have a different build and if the BGs were a problem before they might not be this time around... but with those sorts of indents I probably wouldn't chance it.
I was surprised to find that my favorite diaper changed over time. I really wanted just one to simplify things but our needs just keep changing. I also kind of like having a few different things so I can trouble shoot when problems come up, and some variety so we get a different fit that might not rub or irritate in the same spot all day. Most of the time we're in BG 4.0s and free times, but for back up we have Nana Pants (etsy), Alva bamboo, g diapers, and fitteds (piddle poddles, ecobaby, and tinkle traps).