Today I'ma try to pin down the basic roles. While we could use the traditional terms; front, insert & back I prefer lead, support & push. (If you missed the last post there is some background on the push role you may want to review.) Keep in mind that assigning identities like "front" or "lead" is no more than convenient shorthand. Yes, they describe what the player is doing but the various "jobs" a lead has also changes as the point unfolds and positions change.
In panel B our support (blue) begins in the corner and when the lead bumps to the wire rotates upfield into the MT. They could have as easily swapped roles and moved as did the D-wire pair in panel A. However in panel B we see a common primary positioning because taking the corner allows the support to help the lead move to the wire. In this position the wide support is better positioned to force opponents off their edges allowing the lead to move to the wire. And once accomplished a quick move back inside to the MT is easily done. (Though it needn't happen immediately particularly if no opponent has reached the wire yet.) In this option we see how the layout begins to dictate some of the decisions we make about how to play.
In panel C we have an example of how players working a wire can switch roles in the middle of a point. It is critically important to maintain near constant communication to be an effective support. It is equally important for each player to recognize when their roles have reversed. Every time you see a couple of players run down on the dorito wire or in the snake you know somebody made a serious mistake. And most often it happens when both players end up acting out the lead role and nobody is in support. Now sometimes in supporting an attack the push becomes the primary support and added complications enter the equation. In any event a miscalculation or simple error (or lack of basic paintball knowledge) is frequently the difference between heading for the sideline or hanging the flag.
If this is more than a little confusing so far not to worry. This was just an introduction to the idea of roles and how they work. As we continue through the series roles will take a prominent place as we expand our understanding of basic tactics.