Yes most likely...Morrison wrote Batman then jumped to Batman and Robin and then to Batman Inc. It all counted (until New 52 reset some stuff)
EDIT: Look at it this way...he was going to write Batman thru issue 105...if he leaves after 85 but they spin into a new book then he just writes 20 issues there. DC also gets to promote a "new" #1 on a new title and so on.... "It all starts here..." that kind of promo crap that companies love....