User blog comment:Xilinoc/Ch. 665 - The Princess Dissection/@comment-4718355-20160311133138

makes sense grimmjow saves urahara, he did before against kirge. so hopefully we'll get more light on the deal they made back in hueco mundo. also if you think about it, grimmjow is likely the reason urahara made a counter drug against askin given he was poisoned by him earlier and urahara may have found him, made an antidote and gave it to yourichi during the fight. that would explain how he knew grimmjow was outside.