Havertz is a fantastically skilled player who suffers from not having a "best position". At Leverkusen, he played on the wing, as a 10 or second striker and eventually was given quite a free role once he was established in the team. So now, he's not really suited to any one particular position and will likely only thrive if a team is built around him.
Werner had a slightly different problem, in that he had too specific a position at Leipzig to thrive elsewhere. He was partnered by Yusuf Poulsen in a quite unique high pressing 4-2-2-2 system which perfectly suited his skillset.
Havertz is a fantastically skilled player who suffers from not having a "best position". At Leverkusen, he played on the wing, as a 10 or second striker and eventually was given quite a free role once he was established in the team. So now, he's not really suited to any one particular position and will likely only thrive if a team is built around him.
Werner had a slightly different problem, in that he had too specific a position at Leipzig to thrive elsewhere. He was partnered by Yusuf Poulsen in a quite unique high pressing 4-2-2-2 system which perfectly suited his skillset.