Wouldn't say it's a strange choice, Martine is a good presenter
Yes, but this shift is normally held by the senior presenters (Ben Brown, Reeta, Clive etc) who also do the One (Six and Ten in Clive/Reetas case). Whereas Martine is generally just a news channel presenter.
Martine should be anchoring the Ten anyway IMHO.
Thing is, there are so many so-say BBC One presenters (Huw, George, Sophie, Fiona, Clive, Reeta, Jane, Ben, Mishal, Kate, Simon) that there is no longer that great a need to get news channel presenters on the weekend or bank holiday. I can’t see, if and when one of the above leaves there will be any rush to replace. I can’t see, for some reason, the BBC picking a “rising talent” to take over 6/10 if the main presenters leave. It will probably just end up being Clive or Reeta - two very talented presenters who are more than up to scratch.
Martine is good in terms of being the opposite to Simon on Afternoon Live. But considering Simon will never leave, certainly without getting through me, she won’t be replacing him any time soon