I spent good bit of money in AD2 kits and midipacks past 2 years... I feel EzDrummer 2 will help me better with its different features (specially creating songs).. Would be great If I could keep best of both worlds and use AD2 midipacks (kits are probably not an option) in EZD2.. is there any way I can achieve this?

LOL!
 

IIRC cclarry has a AD2 to EZD2 map.
 

It's not hard to create a drum map to use AD MIDI files in EZD.  You'll need to do this as they use different mappings for the kit pieces.
 
I've done it for my go-to SD kit, and also to use my SD MIDI files in AD.  It probably took 20 minutes. I still use the native drum synth when looking for the right loop, but then can drag it into the alternate MIDI map to have it play properly in the other synth (AD midi in SD, or SD midi in AD).

If you have EZ Player Pro, it's click twice and you are done. (yes, you can use them with EZD2)

If you want to use EZdrummer midi with AD2 kits, clintmartin is the man with the map.  Send him a PM with your email address.
To go the other way around (AD midi to power EZdrummer kits), Toontrack's EZPlayer pro will translate for you. It's pretty cheap at Time and Space.  Very useful tool.