If Rondon and Rodriguez play together (now looking unlikely), they aren't guaranteed to score 20 goals EACH no, but either of them could, given the right service, and the other is likely to be around the 13-16 bracket. I know this will be partly aimed at me, so I should clarify when I talk 20 goals, it is that vague total that covers players who challenge for the top 5-10 goalscorers in the league stakes.
Lots of clubs manage to get 2 players into this list - Brentford had 3 in the list a couple of seasons ago! (Their scouting is pretty spot on, they have had one of the top scorers for each of the last 3 years).
Rondon and Rodriguez, should they have had the chance together in this league, could with the right service scored a hell of a lot of goals, but it always depends on what service we provided them with. Creative teams do score more goals - Peterborough, Brentford etc.
If we do sell Rondon, replace him with somebody who van get around the 15 goal mark, and partner him with Rodriguez, I would be very happy.