The Rangers-owned forward continues to flourish away from Ibrox, and some fans are questioning Caixinha's decision.
Michael O'Halloran in action for Rangers
Michael O'Halloran's post-Rangers career has encountered yet more success.
Not only that, O'Halloran's exploits have helped the Perth side to third in the standings, two places and three points better off than the club he left behind.
St Johnstone manager Tommy Wright
As such, the 26-year-old has seen himself crowned Scottish Premiership player of the month, with Saints boss Tommy Wright picking up the managers' award.
And though few Rangers fans would have batted an eyelid when O'Halloran was banished from Ibrox at the end of July, the Glaswegian's latest achievement has caused some to question Pedro Caixinha's decision.
Rangers manager Pedro Caixinha
Was the Portuguese right to write him off so soon? Here's what people are saying on Twitter...
That should bump his value up a bit.— Jim EBT C (@jimcee1690) 5 September 2017
well done bud pedro shouldve went to Specsavers we should be using u as a striker— scox amnoshy (@ScoxAmnoshy) 5 September 2017
Nice move Pedro.— Stuart Niven (@STNiven) September 5, 2017
To Rangers fan this is like Jim Bowen showing the speedboat at the end of Bullseye "look what you could have won"— Mark Mason (@Markmason1972) September 5, 2017
Meanwhile we have Dalcio— Mark ☻ (@_MK1872) 5 September 2017
Moult has turned down a new deal at Fir Park and can be signed to a pre-contract for next season from the New Year.