Revisiting exchanges with Clyde Winters on the Meroitic script Pt. 3

Continued from: Revisiting exchanges with Clyde Winters on the Meroitic script Pt. 2

As noted in the last posting on this topic, the basic questions that come up time and again about Clyde's Tocharian-Meroitic link, but never addressed by him:

Meroitic script is much older than Tocharian script according most sources. How does that square with Meroitic developing from a script younger than