Role labels help, but they do not explain the full fight. A team needs someone to start space, someone to convert pressure into eliminations, and someone to keep the group stable long enough for the plan to work. If those jobs are unclear, even a normal-looking role spread can feel impossible to play.
Before locking a hero, ask what job your team still lacks. If nobody can contest space, the next pick should help the team move. If nobody can finish a vulnerable target, the next pick should add reliable pressure. If the backline keeps collapsing, the next pick should protect survival and sightlines.