Here's some other stats to inject into the discussion, from this season: (I've injected Lampard in there too for rough comparison)
First the number of passes attempted per 90 minutes:
Harry Winks 74.8
Victor Wanyama 71.7
Mousa Dembélé 68.3
Christian Eriksen 62.5
Frank Lampard 55 (roughly, between 2009 and 2012)
Moussa Sissoko 54.4
Erik Lamela 53.7
Dele Alli 37.9
Son Heung-Min 36.6
Harry Kane 19.1
> Suggests that in possession Alli's more of a 'second striker' or very attacking midfielder, like Son.
And combined tackles and interceptions per 90 minutes:
Victor Wanyama 4.4
Mousa Dembélé 3.3
Erik Lamela 3.2
Harry Winks 3.0
Frank Lampard 3 (roughly, betweem 2009 and 2012)
Christian Eriksen 2.2
Moussa Sissoko 2.2
Dele Alli 2.1
Son Heung-Min 1.0
Harry Kane 0.8
> Suggests that defensively he's working harder and/or playing deeper than Son - more like other deeper attacking midfielders Eriksen and Sissoko