User blog comment:Ghmorello/Chapter 905: What A Load Of Green Bull!/@comment-35359957-20180525082848/@comment-25501246-20180528011546

The Straw Hats do not need a new Timeskip.

1 - Luffy gets stronger every time he fights a stronger Haki user (this goes to all Haki users in the crew). That was stated by Rayleigh. This means that Luffy and co. benefit more from fighting strong foes than just taking a break to level up.

2 - The Straw hats are all getting new power ups consistently. Nami just obtained Zeus last arc, and that was after obtaining a new Clima-Tact. Usopp gained Haki at Dressrosa too. Sanji got a Raid Suit that he or someone else in the crew may use as well.

3 - Not all Straw Hats need Haki, just like not all members of the Big Mom or Beasts Pirates need it. Haki is not an instant signal of strength and those who are constantly fighting in close quarters benefit from it. I assure you Nami benefits 10 times more from having Zeus than Haki ever will.

Plus, Dressrosa set up an opposite scenario of Luffy being caught and Sabo, the Straw Hats and the Grand Fleet going after him. This is because the Vivre Card now is Luffy's.