I think this "taking All Star seat challenge" is just to hype Sasaki and Who's Who so Jinbe vs Sasaki won't seem absurd compared to Sanji and Zoro vs King and Queen
It will NOT be hype at all.. if they simply LOST... that means simply that they are NOT "commander level"... end of story.. EVEN if it was a close match... because Oda will manage to make this All star reveal EVEN BIGGER POWER against our alliance... by revealing a trump card power technique or something he didn't use on this flying 6 member... so eventually... there is NO HYPE behind it... and Oda would be just wasting space and panels for NOTHING basically
On the other hand... let's say that Oda allowed both of Who's Who... and Sasaki.... to have their duels by some plot...
One against Jack
Another against Queen
And let's say the person against Queen... put a good fight... but he lost because simply Queen is ranked as (2nd strongest commander now).... while the other person against Jack... he pulls a Win..... what would that means????
That would mean that Kaido AT LEAST now has 5 characters who are Commander level.....
Because:
1- Jack is commander level anyway
2- The person who won against Jack will be recognized as officially commander level
3- The person who LOST to Queen but Put up a good fight... will be considered among the commander level because sure he lost... but he lost to someone who is considered "HIGHER and Stronger" than Jack... maybe he will lose to Jack also.... BUT people will keep questioning about whether he would have won against Jack instead or lost for the REST of the arc... which will be actually PROPER HYPE