For Maebara the the sparring served an obvious purpose, it was to allow him to prepare for his April 5th bout with former Japanese Middleweight champion Sanosuke Sasaki (11-3, 5). That bout is a big step up in class for Maebara but a step up he should manage if the heavy handed 22 year old Southpaw is to reach the heights hoped of him.
As for Ishida the sparring has a less specific purpose but was done to help him keep sharp and try new things ahead of his Japanese title bout on April 30th with Kyotaro Fujimoto (11-1, 6), a bout that will see the two meeting for the second time following a close decision win for Fujimoto last April.
On paper it was "better" sparring for Maebara, given that Ishida is more like his opponent than the other way around, but from what we under-stand both men got some quality work from it and both seemed to be impressed by the other with Ishida suggesting that Maebara is going to become a very strong fighter in the near future.
(Image courtesy of Ishida's blog)