Valsecchi must be bitter. He has done nothing wrong, and it should be his moment to make impression. He's in dead end.
He has only done two tests with the team this year and has never driven at either of the tracks.
Heikki has experience with the Renault engine, knows both tracks and has done FP sessions rcently, outside a competing driver he is probably the most qualified/suited for the seat.
Edit: In the linked article it says Lotus want an experienced driver.
Yeah, I have nothing against him. But, Valsechhi knows the team and the car better than Heikki. Even if Heikki does have more experience and have raced before, he don't know the car, setups etc. So to me it would be a question of choosing Heikki who has the experience but don't know the car and thus has quite a handicap by that. While Valsechhi has less experience, but already knows the car and have run plenty in the simulator.
To me, it would be interesting to see either of the them driving E21. But IMO it would be more fair to give Davide the chance. That said, life is not fair.
As this is just speculation, if they would choose Heikki, would that be a sign that perhaps he would be their candidate for even further, for 2014? He certainly would not demand high pay for next year, and he would get his chance to make an impression on last two races to help his bid for 2014.