Inflation flattens spatial curvature. Read again what I wrote.
And things still have to travel faster than light to not been seen "after" they have been seen.
That's perfectly acceptable. As long as it doesn't lead to effects preceding causes, it doesn't violate the principle of relativity.
I did read your post and we are speaking of space. Velocities happen in space. Now what determines time? Is it completely fictional? What is time at A and how does it relate to time at B?
"It" doesn't violate causality since we can't see "it" and you are fudging with "time", whatever that is, in the situation describing inflation.