Wound allocation / look out sir / units with mixed saves

Hey Folks, might be going down the rabbit hole with this one, but here's the context.

Recently came up against a Space Wolves list that was almost exlusively Thunderwolf Cavalry with chainsword / stormshields.

Each unit was led by a character of some description to rock the 2+ save, also with Stormshields for the 3++. Now my opponent was running the aforementioned character at the front of the unit to tank wounds, and after the character had taken a bit of damage he was look out sir-ing the wounds on to the Twolves behind.

It's a nasty list, as without pure mathhammer (something I don't find my SMs excel at) or Destroyer weapons, some things just don't die.

Now the mechanics of this taking a few wounds then LoSing bugged me a little, so I've delved into the minutae of it, and here's what I've come up with. Any feedback would be appreciated.

Let's look at the Look Out Sir rule first, specifically for shooting.

When a Wound is allocated to one of your non-vehicle characters, and there is another model from the same unit within 6", he is allowed a Look Out Sir attempt.

So, by this I understand that LoS happens during wound allocation. So let's look at that, but first a quick look at shooting:

All of the models in the unit that are firing the selected weapon shoot at the same time.

Example excerpt: The 8 models now shoot at the target unit. After these shots have been completely resolved, the Space Marine Player then nominates 'plasma gun' and completely resolves the shot with his plasma gun.

No queries here, just wanted to highlight the phrasing of "completely resolved" when it comes to a group of shots from a certain weapon type, as I've heard some odd arguments about this before.

So, back to wound allocation:

Total up the number of wounds you have caused with the weapons that are firing

All wounds with exactly the same Strength, AP value and special rules must go into the same pool

Whilst you're firing the same weapon, some rules like rending means you may end up with multiple wound pools.

If several pools of wounds need to be allocated, the player making the attacks decides the order in which they are allocated.All of the Wounds from a single Wounds pool must be allocated before moving on to the next Wounds pool

This is where it gets a little hairy. It's my understanding that this is where the look out sir happens, before any saving rolls are made.

It's also my understanding that with two wound pools from the same weapon (i.e. 3 Normal shots from an assault cannon) all 4 shots are allocated (and LoSed) before any saving rolls are made.

I've probably digressed a bit, but my original point was that making a few saves, failing one, THEN LoSing the remaining wounds just ain't cricket. You're supposed to man up and say "I'm LoSing this many wounds, and taking this many saves on my manly chest hair".

Thanks for reading my ramblings, comments are very welcome.

Hopefully I've hit the nail, but this'll teach me for playing "inventive" people when I'm tired (which is half of the time) and stupid (which is....yeah).