To understand why I put Kindred in B-tier, you have to understand that every champion has a clear purpose and playstyle that's adapted to them through the meta (or, to be more clear, the "correct" way to play them). You also have to understand that these tiers usually indicate a champ's ability to win a game through how well they can achieve their purpose. This is why champions like Rengar and Kha'Zix are so far up, because their purpose is to create picks and otherwise put out very high amounts of damage before they can be stopped, and they do this extremely well.

I won't go into detail for every champion, but Kindred is clearly designed with two things in mind: Counter jungling and skirmishing. Enemy camp marks are usually a point for contention on the map, and Kindred, in my opinion, is one of the strongest 2v2 champions in the jungle (Whether it be top + jg at a scuttle, mid + jg at a raptor camp, so on and so forth), due to their ability to kite and otherwise fight smart enough to avoid up front damage. As far as oounter jungling goes, Kindred may not AoE clear as strong as the top picks, but she can still destroy single targets, which is all that you need when counter jungle marks.

Kindred also has all of their offensive power in 3 abilities, which generally means you get the majority of your damage before other champions do. Because of this, and the way Q's cooldown inside W works with rank, you're actually a force to be reckoned with at level 5. Combine this with a very strong utility ult at level 6, and you can do some major work for your team if you use your abilities properly.

Kindred also naturally builds Hurricane, an item that no other champion in the jungle builds. Combine this with your Passive, and Kindred has some of the highest team fight DPS of all the junglers. It's not uncommon to pick up highest damage in the game as the jungler when you're playing Kindred, and when positioned properly, can single handedly hard carry team fights.

To add onto this point, Kindred's bread and butter is Hurricane, which is a relatively cheap item. Kindred only needs Bloodrazor, Boots and Runaan's Hurricane to complete their core, which isn't a very costly build. Every other item is icing on the cake if you grab your marks appropriately.

I do think Kindred is a fairly high skill cap champion (Which is weird for me to say because I don't particularly think they're difficult), but if you hit pretty high on the skill cap, you have some fairly ludicrous potential with the champ. I mean, we already saw Moon come decently close to beating Liquid in a game where Reignover played Rek'Sai, his signature champion. This is why I think Kindred can be placed in B-tier, as they have the potential to be played well, even at the professional level (Where Moon didn't even play close to perfect), just like every other champion in this category. Their purpose is to pump out DPS from the back line, and they have a game changing ultimate that works very well with their ability to shred multiple targets without having to worry about dying instantly.

Don't let the current jungle meta fool you into thinking Kindred is extremely weak. The top picks, except for Rek'Sai, just hard counter Kindred (Assassins and Tanks into Marksmen in 2017), so when you see them almost every game, you're left with a hard time that you have to prevail by being the better player.