While I don't rate Henry as a coach whatsoever, I can't imagine how he'd be worse than Valverde.
How it can be worse than ending 1st in 2 seasons?
I'll help you:
= not ending 1st, for example
Fans today are quite spoiled if you think that EV is a an absolute rock bottom.
Look at this:
1999/2000:
Coach Van Gaal:
1. Deportivo 69
2. Barcelona 64
3. Valencia 64
4. Zaragoza 63
5. Real 62
Van Gaal sacked.
It can't be worse than this, people said.
We hired Serra Ferrer.
2001:
1. Real 80
2. Deportivo 73
3. Mallorca 71
4. Barcelona 63
5. Valencia 63
Ferrer was sacked in April when we were out of CL spots.
He was actually even worse than Van Gaal in 2000.
We hired Rexach in April to save the season.
** We secured the 4th place and playing in a CL in the 90th minute of the last round with Rivaldo scissor kick goal in a 3:2 win:
We kept Rexach since IT CAN'T BE WORSE THAN THIS, and things can only turn to better from now on:
2002:
1. Valencia 75
2. Deportivo 68
3. Real 66
4. Barcelona 64
We ended 4th again.
We sacked Rexach since it didn't turn to better.
We re-signed Van Gaal again (something like Neymar-Dembele-Coutinho-Griezmann and let's go back to Neymar current saga), since we thought: IT CAN'T GET WORSE, and he is the guy under whom we actually played well and ended 1st, 1st and 2nd in his 3 seasons here.
Well, things turned to even worse.
In his 2nd spell, in January of 2002/03 season, Van Gaal's Barca was actually EVEN WORSE than Ferrer's and Rexach's Barca.
We were at the 12th place.
Van Gaal was sacked, we hired Antic to save the season.
Antic slightly improved a team and we jumped from the 12th place to the 6th place (lol), and barely securing Uefa Cup spot in the LAST ROUND, lol.
Barcelona was the 7th before the last round (and out of Champions league and Uefa cup spots), while Bilbao was 6th (Bilbao 55 points, Barca 53 points).
Luckily, Bilbao had to play against Real at Bernabeu and Real needed 3 points to secure a title infront of a 2nd place Sociedad.
Real won 3:1, and Barca won 2:0 at Camp Nou against Celta (who had nothing to play for) and we secured a heroic (lol) 6th place and Uefa cup spot.
We had 56 points, only 4 points more than a 9th placed Mallorca.
2003:
1. Real 78
2. Sociedad 76
3. Deportivo 72
4. Celta 61
5. Valencia 60
6. Barcelona 56
7. Bilbao 55
8. Betis 54
9. Mallorca 52
So, it went worse and worse in each new season.
Van Gaal>Ferrer>Rexach>Van Gaal<Antic.
Then we sacked Antic and signed Rijkaaard.
And thought: it can't get worse than this.
And in the first 6th Months of Rijkaard, it turned to even worse.
We were barely above the relegation zone in December of 2003/04 under Rijkaard and he was on a verge of being sacked.
Luckily, a team suddenly started to play better and that was a beginning of a current Barca's era, where we won La Ligas in 2005 and 2006, CL in 2006 and titles in Pep's era.
So, I'll just quote your reply one more time, and are you really, really, really sure THAT:
I can't imagine how he'd be worse than Valverde.