The main reason you'll see some conflicts is due to at an individual level, some pieces will be better itemized than others. However at a full gearset level some pieces gain/lose value due to requirements of hitting caps and optimal reforges.

That being said, the BiS list I provided is based off the simcraft BiS profile.

I'm normally hesitant to rely on simcraft for such decisions, but with it being one of the closest theorycrafting resources we have and BiS profiles leaving limited options when the stat weights are correct (which simcraft is correct in stat weights; coupled with the disparity between all secondary stats vs crit), it means there's very little room for error when calculating which set will provide the most desirable stats when put together. For the most part there's clear winners in each slot, however there are a few that are close (such as the ring) and they seem to be correct.

I've seen reference to this in a few threads and hopefully this post will help clear it up; mainly in reference to choice on the ring.

At an individual level, only with their base stats:

Signet of the Bandit Lord (Galleon ring):

http://www.wowhead.com/item=90438
STR: 682

CRIT: 345

EXP: 518

vs

Ring of the Bladed Tempest (Bladelord ring):

STR: 769

EXP: 402

HASTE: 578

Comparing these two alone and based off the statweights/calculations in his spreadsheet (STR 3.32 / CRIT 2.7):

3972.74DPS vs 3745.64 DPS, the Galleon ring beating it by ~200DPS.

However you'll notice the stats are taken without reforge, meaning the crit you get from taking out haste isn't calculated.

Taking this into account, it now becomes:

STR: 769

EXP: 402

HASTE: 347

CRIT: 231

Which pushes Ring of the Bladed Tempest to 4133.72 DPS reforged, beating out the Galleon ring's 3972.74 DPS when it already has the ideal Crit/Expertise combo.

It's no fault that these results occur and his spreadsheet is a great tool which I use myself. It's just very difficult to take items on individual level and evaluate their worth without all the variables of your current gear, rating caps and reforges.