User blog comment:Miskos3/Fairy Tail 526: My Name Is..., Review/@comment-25111584-20170312223358/@comment-7418318-20170314134217

That argument about Ultear getting abondoned is getting old and stale on top of being wrong.

Ultear wanted CS to not come after her and they respected that wish.

Minerva on the other hand just disappeared without a word. Not to mention that we didn't see anyone being particularly heartbroken over her leaving or putting much effort into finding her.

Only when Erza wrote that letter about Minerva having fallen in with a Dark Guild did Sabertooth remember that she was their princess/lady and that they were supposed to care for her.