I hear you on Miller that'd be a difficult thing to get over for me. We disagree on Henderson. He was fantastic in the G League last year.
You're 100% right though, the chance of Henderson/Miller being better than KAT is probably around 10-15%. It's unlikely. However, KAT is 27 years old, he has missed significant time in 3 of the last 4 seasons. This draft is generally considered to be pretty deep, even outside of Wemby.
I can definitely see your point and I think that staying put could definitely be our best option. I don't hate the idea of rolling the dice on a high upside player like Henderson, but I am definitely not desperate to move KAT.