Its dumb you get the rewards for your position at 12 PDT many players attack at 11:59:55 PDT and someone find his 6th position he holds all day suddenly is a 43th position.
To avoid this dirty trick arena rewards should calculate the average position every 24 hours, so if you have been 12 hours in position 24 and 12 hours in position 6 and 4 seconds in position 43 youre given a reward of position 15 ((6x12h + 24x12h + 43*0h/ 24h))
This way encourages people to keep positions all day and not try to get a higher rank 5 seconds before the game sendingg rewards