No real need for the whole thing, here's the relevant bit:
You must decide which units are splitting into combat squads, and which models go into each combat squad, immediately before determining your Warlord Traits. A unit split into combat squads therefore is now two separate units for all game purposes,
Whilst looking that up, I noticed that
GW have been copy-pasting that rule for so long, it still has a reference to the 6th edition limit on how many units you could put in reserve
Tactically, I'm not sure on the use of the Razorback - if you've plumped the special and combi into the drop pod, that leaves either a heavy or 5 basic guys to make use of. If you've taken a heavy, they're better off outside plinking away, so it's only of use as a taxi for the basic chaps.