I disagree. And it shouldn't even be called tone for this matter. If you look at the gear aspect of the trying to achieve a sound, this is possible. This can just be duplicated by getting the exact same gear (obvious) and achieving that exact 'tone'. However: When you add a player into the picture, he dosen't bring his 'guitar tone' in. He brings his individual feel. Anyone can get the same tone from the same setup. If you had different guitarist play through the same halfstack consecutively one after the other and playing the same guitar, the guitar tone wouldn't change because the guitar tone is being achieved through the guitar, it's pickups, wood, amp, cab, etc. Each player though would bring their own feel into the sound, which I could understand that as being something that people would say changes tone. Even though the amp would stay the same, different players vibrato different, pick different, etc, etc. so It'd just be a matter of the way the riff is played be different. In other words, It's possible to get the same guitar tone yes. But you'll never recreate Adam/Joel playing that riff because you're not them (Obvious).