TBF it would have been a short notice opponent change for Magomed as well, since Glover and Jan are different styles. Plus Magomed has been training for a 3 rounder against Jan, while Glover has been training for a 5 rounder against Jiri.
Glover would probably have a better chance against Magomed in 2 weeks at UFC 282 instead of in 2 months in Brazil.
Glover should have taken this opportunity. Did Glover really think he would have fared better against a 5 round ready Magomed who has a full camp designed for Glover???