Harry Kane is already a goal scorer, as his scoring techniques can be seen when he was playing at Tottenham and now he has still continued even in the German bundesliga so he is a nice player that can be productive to any team. Talking about Guirassy, this is also an important player that have been very active in scoring goals for Stuttgart and just like you said most big teams prefers a goal scorer and Guirassy can deliver in that regard so if he becomes an expensive player it would not be a thing of surprise again because he can prove his worth anytime, anywhere.
I don't believe Thomas Tuchel to be the main cause of Bayern Munich infertility this season. They've struggle to win games and not able to win their usual bundesliga title which happen to be their birthright. Bayern Munich have suffered and will not hold unto the precise momentum this season. Bayern Munich top goals not meant this season, despite the signing of brilliant players, they still struggle in matches. Harry Kane have served his purpose for Bayern Munich this season. Scoring goals and hitting new levels every season should be concerning.