Not really madness or insanity at all IMHO.
From memory at least 6 of those 15 goals came when Kane was injured. The 2 x hat-tricks.
And I would bet the majority of the remaining 9 goals he got came when either Kane or Son were out or used as a sub. (He started a lot of games last year with Kane injured and Son away).
Playing all 3 of them together has rarely worked
I think on occasion it has, although I wouldn’t say it’s our best formation to play by any means. Need better defensive midfielders.
So to me playing those 3 as a front 3 every game would be madness with our current personnel.
And if you think dropping Son for Lucas is not insanity then fair enough.
But I 100% think that dropping Kane for Lucas would be insanity.
So maybe some sense is in there somewhere.......
Playing all 3 them together has rarely happened that's why.