HALO Jump Flares and the Building Flares

I completely agree about with the MUTO and the high altitude idea being that they're so high up- reason being to get away from the flying MUTO's wraith. And concerning the building flares from the second trailer, why shoot it so close to him if you want him to follow a path?

The only thing I don't understand is why would they shoot their flares so close to big G/at him? Its not like his field of view is focused on what's feet away from him- but rather a mile or two away IMO.  and plus, the HALO jumpers essentially fall on top of godzilla. Not really at a significant amount of space ahead of him. It's as if they'd have to do countless HALO jumps to keep him going in the right direction.

I first thought that the HALO jump was to go extract whoever was in the buildings that the flares were shot off of because perhaps they're imporant people or something. Idk :/