I dont have time to comment fully on the chapter, will do this later today I guess. For now only two things
1. The cage shrinking and this urgency and battle with time is something we see again and again in OP. The grander picture and Luffy being the one to make sure he prevents the epic catastrophe :P
2. This was on purpose. Basically Luffy shown using two of his best attacks right of the bat and them being brushed off as he just threw a random punch. To show basically how strong Dofflamingo is and make us worry.
Heh…