Sims, Post 3 below. Sabertooth is currently bugged on Beta due to not refreshing Open Wounds.
I am still testing on beta and simulating accordingly, so take this with a grain of salt.
All of this inherently ties into the amazing artifact dragon we get: Ashamane's Bite.
Yes it is still a crappy 3% proc (pending tuning), but it is shadow damage that mirrors your Rip, that is your most powerful ability (And the most powerful ability in the game from a pure DPS impact perspective).
Sabertooth synergizes incredibly well with this, so much so that it is amplifying the DPS by nearly 5% over JW or EG.
1. Sabertooth snapshots your initial Rip for the rest of the fight; that is your strongest Rip - meaning any and all shadow rips will also mimic your strongest Rip.
2. Sabertooth increases your >50% Rip uptime.
Typically you opt to let Rip tick well beyond its pandemic (especially if its snapshotted), which means depending your RNG, your shadow rip can spawn at 1s - netting, pretty much, 0 damage because your Rip ticks always hit on the 2 second mark. Thus, in most current raiding logs (as Ferals opt for JW or EG), their shadow rips are only parsing 2-3% of their gameplay as 50% of the time these rips are spawning at 10s or less. If you take Sabertooth, on the other hand, the Rip will more or less be refreshed at around the 50% mark (maybe a bit lower if you take SR), net result being more Rips above 12s, more shadow rips above 12s. The effect is so dramatic that the 2-3% of your total DPS rises to NEARLY 10% OF YOUR TOTAL DPS.
The other benefits to this is of course you'll use more FBs, you'll use more BT stacks on FBs rather than BTs on Rips
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Jagged Wounds brings forward two glaring issues - reduced Rip uptime (ESPECIALLY if you take SR, like you are considering 80% Rip) or no FBs at all (some people are opting for this - to not use FB at all), and reduced shreds (which, moving forward, is a terrible idea cause your entire set bonus revolves around squeezing as many shreds as you can in a rotation).
EG on the other hand makes things easier as it lets you set up your SR pre-stealth and gives you an easy refresh of SR every 24s. Problem is, with SR, you are resource locked more heavily than CP locked. These extra CP will not benefit you, relatively, and more often than not, you'll end up overcapping CP on the timed release component. You also have to manage your energy even more heavily than you already do since you need to hit 5 CP, then finisher, then EG, then finisher and then finisher soon if you want to maximize EG every 45s.
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So when will JW be useful? AoE situations - you'll get to use more Thrashes and more Rakes across the board - proccing more Shadow Thrashes and limiting use of Swipe. Brutal Slash is for burst AoE situations that are 45s apart, and you can use it in your ST rotation if the phases are further apart (so if the trash is every minute like Iskar Mythic Progression days, then you'd use one stack in ST rotation). This is where BT shines, with JW; the CD actually makes sense because you have so much to do in between doing that heavy hit. You'd typically want Thrash up 100% of time (due to shadow thrash) and from there Brutal Slash not capped at 3 charges, Rake up on everything, and if the adds are under 30% HP, ignore Rake - refresh Thrash and eat up your Brutal Slash charges.
And when will EG be useful? When you have a lot of disconnects or main-target swaps (not council, but timed swaps).
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Let me know what you think. Of course its not that great until you unlock that artifact perk .