While De Gea hasn't made many clear errors, and has made a few impressive saves (Callum Wilson at Newcastle), his stats in the PL this season are horrendous:
Out of the 20 keepers with the most appearances for their team, he ranks:
- 19th for save percentage in the PL this season (53.8%). Lowest is Ryan of Brighton 50.0% then ahead of De Gea you've got Patricio of Wolves and Martinez of Villa 62.9%, another five keepers between 66% and 69%. 9 keepers between 70% and 75%. Lloris 81.3% and Mendy 83.3%. Last season Kepa Arrizabalaga was at 54.5%. De Gea has only had one PL season in which his save percentage was below 70% and that was 69% under Moyes.
- 16th relative to post-shot expected goals. Currently - 1.0 (so conceded one more goal than expected from the shots that were on target). 12 keepers have conceded fewer goals than expected. Sam Johnstone top at + 3.8. Post-shot expected goals is a relatively new concept. This is the 4th season for which there are stats. De Gea's past 3 seasons were + 7.9, + 0.9 and + 2.1 (last season).
- 20th for taking crosses. 1.6%. 10 keepers between 5% and 9.7%. 3 keepers currently above 10% (De Gea has always performed poorly in this particular stat. Again 4th season for which there is data)
- 16th for sweeper keeper. 0.35 per game. 8 keepers between 0.70 and 0.90 per game. (De Gea has always performed poorly in this category. 4 seasons of data).
I don't know how you assess passing from the stats available. He may be performing better at this than many other keepers.
Of course, the sample size is very small at the moment.
De Gea's save percentage in the CL is 60%. Across the two competitions it will be below 60%. Henderson has saved 8 out of 11 shots on target in PL (7/8) + CL (1/3).
All stats from:
https://fbref.com/en/players/7ba6d84e/David-de-Gea