Best Case
Rob Holding remains injury free the entire season, playing almost every game and is one of Newcastle’s top performers.
He blossoms into the player many Arsenal fans hoped, and is considered amongst the best defenders in England, gaining a spot in the England squad for 2020/21.
Holding returns to Arsenal to take his place in the first team.
Middle Case
Rob Holding remains injury free the entire season, playing almost every game and performs well for Newcastle.
He forms a good partnership with Jamaal Lascelles but does not consistently perform to a higher level.
At the end of the season he has a choice between being a squad player at Arsenal, or joining Newcastle permanently to play week in week out.
Arsenal would receive £25m+ for the proven, but not top draw, centre back.
Worst Case
Rob Holding continues to struggle with injury, and when he does play it a fairly average performer for Newcastle.
In and out of the team, he is outperformed by Jamaal Lascelles. Newcastle do not see him as a regular first choice so move on to other targets.
Holding them returns to Arsenal where he has proved himself to be adequate enough to be 4th choice, but no more.
The alternative option is Arsenal sell Holding to a promotion chasing Championship team for around £10m
Current Case
With Gabriel and William Saliba joining the club, Rob Holding has found himself as 5th choice centre back. David Luiz and Pablo Mari also ahead of him.
Holding is yet to start 10 Premier League games in a single season and is now 25-years-old, having also come off a bad injury in the last 24 months.
There are plenty of sides interested, but due to question marks about his lack of consistent performances over the last 4 years, none really want to invest big.
Interested sides would likely buy Holding and another similar central defender, splitting their funds and risk between the two.
With COVID19, the most Arsenal could expect this summer would be £10m.
Keenos
She Wore A Yellow Ribbon 
Mari is ahead of him only after one game? Don’t make me laugh. Same as Cedrac ahead of AMN?
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Arsenal currently have 8 first team centre backs, saliba luiz gabriel (if signed) would appear to be first choice. Chambers Holding Mari would appear to be next in line Mustafi and Sokratis look likely to be on their way. We have at least another 2 players (Tierney and kolsinac) who have been standing in on the left of a three.
If Arteta is to play 3 at the back, then he should sell one of Holding Chambers Mustafi. Only if he feels Ballard, Clarke, McGuiness or Dinzeyi are ready if needed should he allow more than 2 departures from the current list of 8.
It is our last chance to get some money back on mustafi and sokratis, whereas English players like Holding and Chambers are more useful as being homegrown and having longer on their contract.
Next season we will be promoting the class of 99 to our homegrown quota, that is the time to consider allowing homegrown players to leave.
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