[Jac Mac]

Arrow on pic shows where 'gap' between inner/outer splines of clutch hub/axle gear should be.( Looks like it is- should be easy for you to see.)

To me pinion support roller looks like it might have been hot in your photo ( thats the one at axle end of pinion.)

Like others on other threads have told you 9" are a little daunting if you have never set one up before and as you are likely to be fitting a 'New R&P' you will have to go thru a pinion shim thickness selection exercise. Once that is done the rest of the setup is fairly basic.--
I always fit a solid pinion spacer rather than the factory crush sleeve which adds to setup time, but pays dividends long term especially if your making a few HP.
You really need to strip the whole head assy first to decide whether to try & save it, or purchase a new unit.
BEFORE removing caps from carrier, punch/mark them in relation to housing so you get them back on correct side, do same for pinion bearing housing to make life easier.