Yep it simple to see the sky split after rocks hit away roger and grap .
Who did a attack and block so there haki was part of it .
It doesn't matter
However, in these attacks, one person is the attacker and the other is the defender
For example, Whitebeard attacked Roger and Shanks first and they only defended
The previous page clearly shows that they are all using advcoc and Roger and Rocks are clashing
The difference is that Rocks was able to surpass these two people, it doesn't mean that he did it alone،
When we see Joy Boy's haki, at that time no other person was using haki, but in this page, 3 people were using haki at the same time
The difference is clear, Joy Boy was not clashing with others