The Sharks occasionally run a 5-forward setup on the PP (they haven't scored any goals while using it yet afaik) because defensemen upset Celebrini. Roger that.
Forwards are players who tend to attack better and defend worse. Which is why they are forwards.
Michkov's coach is conservative and runs a balanced system that includes defensemen, unwilling to increase the risk of conceding SH goals. He coaches to win, not to pad stats. Do you think a 37-year old 5'9 rookie head coach will have the guts to run a system that could make a shiny 1st overall pick upset?
Which is why the Sharks have already allowed 53% more 4v5 goals than the Flyers. Moreover, the Sharks are 2nd worst in the entire league in goals against! While the Flyers are only 4th worst.
Also, while Celebrini is so very 2-way, where is his goal differential? It's worse than Michkov's.
But seriously, you do realize that the Sharks have done any of this only a few times this season and didn't score nor allow any goals while doing it, right? It isn't
"a system", those were occasional tries.
Furthermore, that Jake Walman is 10th in PPG between the NHL defensemen, 3rd in PPG and 3rd in scoring amongst the Sharks players so purely numbers-wise, removing him from the PP is actually hurting the Sharks, not padding anyone's stats. Which is probably why they tried it in games they were significantly behind and unlikely to come back in anyway.