Please, For the love of all that is holy, don't do this. Ever.
Everyone will hate you for this. Especially ninjas and healers.
For NIN that will just leave a half used doton behind and they won't even get to reset their mudras with a quick hide in between pulls, since you won't get out of combat between mob groups. Since mobs tend to spead for various reason you can't even AoE them down properly while moving.
Healers will end up with with a half wasted bubble or earthly star.
Even if you tell your group that you'll pull this way, it is still horrible.
They can either waste cooldowns on the first pull to get you to move faster, leaving them burned out when you finally gather up group 2 or 3; or they put in the least amount of cooldowns possible to save everything for the big group and thus make the first 50% take forever.
Do single pulls or do big pulls, but please do never do that.