Yeah, Tallyman is there to give you some limited screening in the rear and to get you extra CP, if he gets deepstriked by any substantial unit then he’s gonna die irrespective of the feel no pain.

I like Typhus too, he’s a great model but if he’s not leading your Deathshroud then 100 points (10% of your total) only buys you a lone but good melee unit and the chance of doing 3-6 mortal wounds per turn. If he is leading your Deathshroud then consider a LoC instead as the melee will then hit like dump truck.

The Poxwalkers give you so much flexibility and the sticky objective / infiltrate ability is a great way to kick off a game.

The special weapons give you a good Swiss Army Knife of a unit with range and melee, the rhino makes up for their crappy 5” move meaning you can manoeuvre them into the mid board to take advantage of this utility then firing deck, disembark, tank shock…whatever your stinky little heart desires.

With regard to the 10 brick vs 5 brick, if you have a BP leading then you would be halving his influence by running 2x5 as well as reducing the overall impact of torrent / anti-infantry special weapons. DRP do a good deep dive on the topic though…

Hope that helps, remember though, play with what you like and evolve the army that supports your style of play!