No, there are certainly plenty of tall guys with defined abs weighing a buck fifty, but we were talking about an "athletic look." Beckham, handsome though he may be, if I saw him on the beach, I wouldn't think "that guy is a professional athlete." He has abs and nice tattoo work, but he's skinny.
But like Flip said, everyone's goals are their own thing. I'm just giving you an outside perspective of what I understand "athletic looking" to mean.
I promise you, they are not. Cardio work, even "high intensity" cardio, will not build any leg muscle worth mentioning unless we're talking about resistance-based cardio (like prowler/sled work). And even then, it's very rarely being done instead of weight training for the legs.
You don't have to "get fat" to gain size, but the point remains, you're not defined now and you said you eventually want more mass than Becks. It makes no sense to take step or two backwards right off the back (cutting for the next few months), before focusing on building muscle 100%. If you decide not to, that's your thing.
Especially at 6' tall, a fairly lean and well-muscled 190 pound body looks "better" and more athletic than a very lean and under-muscled 160 pound body.