Trumpet Connection Shape Problem / Solution

Correct order of moves according to the 8 dan  

The stone becomes redundant. This is a fine example of the B2 Bomber, and of the major inherent weakness of the tiger's mouth connection.

White to play after 2 and 4  

What is the correct response to ? And if and come next, what is White's best move then?

FCS:

This is the response to Black 2  

--HolIgor