First of all, every position is important in the success of a team even though some positions require more priority than the others. Arsenal needs a striker, but will it solve their problems? that should be the question because Arsenal is one of the biggest clubs in England but for most seasons, they haven't really given football fans what they want which is the trophy but that notwithstanding, if they have strikers without a backup from the midfields or a solid defense it will still be a problem for them so let it not look as if they are looking for solution where there is no problem.
      Arsenal's management is not dumb, they are seeing the complaints of the fans and even the coach, they know what is best for the team and i think they are waiting for the appropriate time to announce what people want to hear because Arsenal is a team that is loved by many all over the world and not only Arsenal fans so the club's management knows what to do to see that Arsenal still continue in good performance even if they don't win trophies. The beauty of a team is winning trophies but the entertainment that comes from it is another thing to look out for which Arsenal have been producing premium entertainment for quite some seasons.

I think a coach should know what his team needs. He can check previous records of what happened in his team and make the changes that need to be done. The coach will definitely try his best to prepare his players and recruiting players is one of the ways that the coach will do. The goal of the team is to score as many goals as possible and get the win so this requires the team to do many things to improve its performance. If the recruited players can make a significant contribution to the team, they have a chance to win.

The coach is the one that signed zubimendi and I feel he has his reasons too because he is the one in charge of managing the club although the entire world tend to see the effects of not having a pure number 9 in the squad but truth be told since that time arsenal haven't been that bad either atleast they score goals and also win games but the number would add an extra edge to the squad but if the coaches doesn't feel the urgency then he will bear whatever consequences that follows the action.

Arsenal keeps making signings that appear like they are not needed,  they have a good squad and they lack striker as everyone can see yet it looks like they have continually not wanting to sign a striker at the moment and that could be one of the reasons for that sarcasm,  even some arsenal fans that I know make light jokes about Arsenal sometimes in for of such sarcasm but I believe Arsenal and their management has everthing under control as seen in their performance,  their level of brilliance is such that they appear sometimes like they have the striker we are expecting they sign.  Let's hope that before the end of the transfer window,  they will be able to make some transfer deals and get a striker.