You are seeing something I am not, tbh.
An injury to a DM or CB would leave us where we are now.
The striker options are still not good enough.

As soon as you let Rosicky go Cazorla will get injured.

Also Wenger will always squeeze Wilshere and Ramsey into the team before anybody else.

For me I would have a summer time cull and re-think

let go / get rid:

Diaby, Podolski, Flamini, J Campbell

Loan out: Sanogo, Martinez, Gnabry

get in:

A CF, A CDM, 2 x CB and a winger

we only need one change

I personally think we should forget about upgrading our attacking options at the moment. Our defensive options need a massive update.

Cech - If he wants to leave and wants to remain in London we surely are massive favourites to get him.

Hummels & Van Dijk/Schar
Cavalho & Khedira

I'd sell or allow the following to leave -
Diaby, Podolski, Rosicky, Mertersacker, Flamini, Coquelin,

In the big games plonk both Khedira and Cavalho in the middle as let the big team try and bully us.

Cech
Dubuchy - Hummels - Kosielney - Gibbs
Ramsey/Cavalho/Khedira (any2 of these)
Walcott - Ozil - Sanchez
Welbz/Giroud

We do only need one change!

It won't matter who we sign, we will still get beaten by the big boys.

Wow! Only 4! So, with no one leaving, we only need FOUR new signings!!!

That's realistic!!!!!

We will sign 1, maybe get another on loan.

We've always needed 3-4 signings.

A few flaws.

I see Chambers as more of a RB than CB right now. He will need time to develop as a CB.

Diaby. RIP

Pod and Campbell aren't on Wengers radar for some reason and Gnabry has disappeared.

Giroud isn't good enough and welbeck isn't setting the world on fire either, but I haven't lost all hope yet.

But we have Wenger in charge, so it doesn't matter what anyone thinks. He will probably just add another attacking midfielder.

We dont need another goalkeeper. Not our priority. We need defensive players.

When at one time we have all players available we have a pretty good squad.