Ten Hag was heavily criticized after losing to Flamengo's youth academy. Now, he absolutely must win this match to avoid a similar setback. The Bundesliga is starting now, and there's no room for error. Every game they play incorrectly will drop points and push them away from the championship. What the Spanish manager has left at Bayer Leverkusen is a team that is contending for the title. If he lets that slide, he won't be in charge for long. I still question his suitability for this role. Perhaps there could be better options.
Based on your points it looks you are concerned about Ten Hag ability to succeed as manager for Bayer Leverkusen. You feel that team he took over is good enough to contend for Bundesliga title and after loss to Flamengo youth team you believe he is under pressure to perform well from very start of season. And yes you are right in your points but saying that he is not right person for this job is not good at this time I think they should give time I hope he will change his tactics to make team best.