Shiki already fought 2 top ties at once for 2 days in high diff battle
He lost
Roger too will lose to 2 top tiers. Same with WB.
Since Shiki wasnt far from Roger
And Garp is also closer to Roger
Even Rox lost to Garp and Roger
Nobody can solo 2 high top tiers at once
No man. garp is comparable with Roger and WB.
We already explained that Roger beats WB extreme Diff.
No wonder Shiki lost to both of Garp and Sengoku.
I was replying to the guy who ranked Roger fight as this:
Roger vs BB ( Neg diff)
Roger vs Shanks (Low diff)
Roger vs Big Mom (mid diff)
Roger vs Kaido (High diff)
Roger vs WB (Extreme high diff)
Garp is in the same catagory as Roger and WB. And the spoiler this chapter only proves it more!
So, when I say Roger can take on two Yonko, I mean the CURRENT ONES (BB/Shanks/BigMom/Kaido)
However, you cannot bring someone in same catagory (WB or Garp) and then add to him (Sengoku) and expect him to win!
Remember also the movie 0, where Sengoku told Garp (Shiki is mine) while Garp was headed there for Roger.
You cannot put Roger in the same shoe as Shiki because Roger is better, simply
And also you cannot put Roger's enemy in same shoe (cause fighting Garp/WB is harder than fighting BB/shanks)
So, yeah, I believe Roger can wipe the floor with both BB and Shanks at same time.