Bill McDonald became a free agent after he was sacked by Ten Brisbane at the end of 2012 (though IIRC, Georgina Lewis was originally going to be let go, only to be retained), and Seven pounced on his services, pairing him with Sharyn Ghidella to refresh its weeknight 6:00pm bulletin, which as we all know backfired in the long term.
What they should’ve done was pair McDonald with Ghidella on weekends, and kept Kay and Rod on weeknights. But that would’ve meant a demotion of sorts for McDonald, who had been presenting Ten’s weeknight bulletin between 2004-12, and also read the sport for a while before that (during which Geoff Mullins was the chief male newsreader).
(off-topic) Similarly, when Andrew Lofthouse joined Nine in late-2008, he was initially paired with Eva Milic on weekends, only to be promoted to weeknights only six months later when Bruce Paige stepped down.