I got Navajo Pony in 2015 and really love those blooms, but alas, it does lean as you can see in the first picture. No rust, each bloom near perfect, and it blooms for about 3 weeks between late June and mid-July in my zone 6b garden. It did multiple well and produced a lot of scapes. I have not seen rebloom on it, which is not unusual for me.
Leaning scapes are splayed out all over the area.
These next photos show the same bloom on a scape from 2019. This scape did not lean and shows the 3-way branching. Probably more like 10-12 buds per scape instead of the registered 16-20 in my garden, but I don't fertilize or water a lot.
Lots of blooms at once makes a pretty bouquet.
If this one leans any more in future years, I may get rid of it, but it will be very hard to cull with beautiful blooms like this.