Aero//lightweight for big guy

Hi all,
I have been riding a Specialized Allez sport for the last 2 years and am to buy a higher tier bike. The Allez was a good bike but I need more! Traditionally all I have heard was light, light, light in regards to bike choice. About 3 months ago, I was taking to a well respected ex-pro, who`s opinion I highly respect, who very bluntly that I stupid for chasing a light weight machine and to go with the latest trend and get myself a road aero bike. He then proceeded to tell me that if I am 100kg and 6ft 3in, with not a stick of fat a light weight bike was pointless.
I can see the sense in his thinking? My latest bike visits have me looking at the Argon 18 Nitrogen.
Any comments please...particularly interested in aero road bike owners and big lads!
I have been riding a Specialized Allez sport for the last 2 years and am to buy a higher tier bike. The Allez was a good bike but I need more! Traditionally all I have heard was light, light, light in regards to bike choice. About 3 months ago, I was taking to a well respected ex-pro, who`s opinion I highly respect, who very bluntly that I stupid for chasing a light weight machine and to go with the latest trend and get myself a road aero bike. He then proceeded to tell me that if I am 100kg and 6ft 3in, with not a stick of fat a light weight bike was pointless.
I can see the sense in his thinking? My latest bike visits have me looking at the Argon 18 Nitrogen.
Any comments please...particularly interested in aero road bike owners and big lads!

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Posts
You can be fast on a non aero frame you will be a few tenths of an mph quicker on the most aero frame compared to a round tubes bikes from the 80's. Enough to make a difference in a breakaway but not in a group.
At 100kg having a light bike is quite pointless.
I don't think in a cat 4 crit race having an aero bike will make any difference unless you can break and stay out in which case you be cat 3 before you know it.
This is all from a bloke who has just bought a Look 795.