With the bookies' favourite to succeed Harry concentrating on preparing his Charlton side to face Liverpool at the weekend, and not commenting on the speculation regarding his future, it is Mark, who knows both camps well, who is able to give an insight into the situation.
The Addicks' under-19 coach reveals: "I think there will be lots of people who will be disappointed to see Alan go if he does go, but that is only natural because of the job he has done at Charlton.
"The Charlton fans hope he doesn't go and I'm sure all the staff feel the same way as well."
He says Alan is a different character from Harry, explaining: "They are two completely different characters, and two different types of manager as well; but everyone is different, and I'm probably different to the pair of them.
"His players are very disciplined in what they do, whereas I think Harry is a little bit more off the cuff, and he lets his players express themselves to the ultimate.
"On the shape side, Curbs has done it extremely well, which is why Charlton have done so well.
"He is a bit more rigid, and knows what he wants, and gets the best out of the players that he has got, whereas I think Harry is a bit more blase, which is fine because a lot of managers do exactly the same.
"I think Curbs is more of a tactical man; he knows his shape and how he wants to play, and he'll stick by it."
With whoever takes over, the inevitable debate about whether you can play Paolo Di Canio and Joe Cole in the same side will be refuelled, and Mark says: "I wouldn't like to say what would happen; any manager coming in might say 'I want to play them both' because they are two very very talented players, and they might find a system for them to make the team click - it can be done."
He jokes that he has not applied for the job himself, adding: "I was going to go for it but I think I'm about six years too early - maybe next time around!
"Obviously there is a lot of speculation and Charlton is in a stable position, something that has been achieved in the work of the last ten years."
Character-wise as well as with their football philosophies, Alan and Harry are different, reckons Mark, who says: "Alan has a very good sense of humour although he is a bit more quiet than Harry who is a very bubbly character.
"But at the same time when you talk to him he is a very funny fellow and good to be around.
"I would have thought that West Ham want to get someone in as quickly as possible after the game at the weekend so that they can start building for next season which will be difficult for everyone in the Premiership because Fulham and Blackburn will have quite a bit of money to spend."
Mark will be interested to see if Jermain Defoe plays in the final game of the season.
The teenage striker signed from Charlton is eligible to play because Bournemouth, where he was on loan, missed out on the play offs.
Harry had hinted that he would give him his first taste of league action in the top flight if Middlesbrough themselves were free from relegation worries.
But the decision now rests with Glenn Roeder - who has already decided on his line up.
"I was watching Tony Carr with the youth side earlier this season, and I was watching Harry's work with the first team, and I saw Jermain for the first time.
"It was scary what he could do with the ball; he is definitely one for the future and I'm pretty sure he will feature next year."