It would make sense. Perhaps Brittney is going to do weekend morning weather and Amy is going to take Sams place doing the weekday morning weather if Sam is going to GDNY. It would make sense given Sam has subbed on Live and GMA. In fact he did audition to co-anchor for Eyewitness News during the weekends in the late 80s. I think he would make a good fit for GDNY and that he could work well with Rosanna. John Eliot is another possibility although I think Sam would be the better choice.
Also it’s better hours for Sam. Even tho 7am is still very early it’s not as early as 4:30am is.