i've used keeper's with better handling and again due to the overpowered shots in the game, it doesn't make a difference.
the only time i have seen handling make a difference is at corners when they pluck the ball out of the air, instead of punching basically.
height basically stops a lot of shots that would fly in with other keeper's, i mean they save those near post shots for a start as well as long shots into corners a lot of the time.
therefore 6'6 makes a huge difference, then add in his stats.
i personally would say kicking is the least important of all of them. then handling.
diving, reflexes, speed and positioning combined with a mountain = lots of saves other keepers no matter how good their handling is just wouldn't save.
doesn't matter if they get a rebound either, because of how fast he is, he saves them too.
seriously for anyone who hasn't tried him out, give him a go, his NIF was amazing for me and the IF has been solid as well so far. i defend very well and with 5 at the back the only shot people usually even get a sniff off are long shots, and for them Guilherme has been the best I have used so far.