Across all competitions, yes. I'm talking 20 in the league, but let's break his scoring down:
His 13 goals in the Premier League (played in 22) have been:
vs Sunderland 1 (pen)
@ Stoke 2 (1 pen)
@ Swansea 2 (1 pen)
@ West Brom 2
vs Middlesbrough 1
@ Burnley 2
vs Burnley 1
@ Sunderland 1
vs Liverpool 1
8 goals in the Champions League (played in 7 games) have been:
@ Steaua 3
vs Gladbach 3 (1 pen)
vs Monaco 2
4 goals in the FA Cup (played in 4) have been:
@ West Ham 1
vs Huddersfield 2 (1 pen)
@ Middlesbrough 1
He also featured for 19 minutes against U****d in the League Cup, but I'm not going to count that as a competition we were taking seriously.
In summary, Sergio has played in 33 games this season and scored 25 goals, 5 of which have been penalties. On the face of it, this is a good return.
However, when you dig deeper into the statistics, he has only scored in 15 of the 33 games (45%) in which he has featured.
On a Premier League level, Sergio has scored in 9 of the 22 games (41%) in which he has played. Compare that with Ibrahimovic (48%), Mane (50%) Kane (50%), Lukaku (50%), Costa (62%) and he is lowest of the other best strikers in the league.
He's also only scored against one of the top 7 teams (there is a significant gap below Everton, hence this unusual cut-off point). Compared with Ibrahimovic, Lukaku, Kane (all 2), Mane, Costa (both 3), Sergio is again bottom of the pack.
Factoring in all of these things, plus Aguero's increasing lack of clinical-ness in front of goal, I maintain that we need an experienced striker who will score consistently.
(sorry for the long post, I got a little carried away).