I have not heard a post where someone mentioned Invincibelle suckering so let's see if someone else chimes in.

You cannot get blues from a H. Macrophylla that originally blooms white. Maybe she is planning to replace the plants?

I have two "invincibelle spirit" in year 2 in my garden. So far all blooms have been pink

You'd think growers would be producing this from cuttings - or maybe even tissue culture. You get different features from suckers when plants are grafted, and the roots are a different plant.