I'm a big fan of Son and its hard to argue against his record/performances this season.
I guess being a top team means we need more than one option off the bench and I think for all Son's attributes, his not as 'pacey' as was originally thought. Besides, his best from the left, I would argue we need a impact player from the right (in the Mane mould). Poch/Levy has shown they want this type of player, think Njie and GKN.
Lamela coming back could fill this gap but he is hardly pacey ether.
Its a conundrum but fuck its good to be a spurs supporter these days, cant recall a time in my 27 years of life when I had to scratch my head and think about who I'd replace in the first 11.