Question about an old myth: "Does Riot have an algorithm to stack odds against you in promos?

As the title suggests, some believe it true, some say it's just a myth, some said that Riot did confirm it, etc.

For me, I ask because for the last 10 promos, I notice one pattern that, even tho it does happen in normal games, occasionally, it happened in every single game, the jungler would lose the game by 1 of 2 methods:

• Gets outplayed completely by the enemy jungler, for various reasons
• Decides to afk farm and not gank (most common one), many times the difference between the enemy jungler's K+D is 9+ compared to my jungler's early in the game. And no, my team's jungler isn't something like Shyvana, but stuff like Jax, Xin, WW, regardless of the jungler type, the enemy jungler would gank and camp, while mine would afk farm. In 1 of the games, a J4 actually told my team: "please stop feeding, I need 1 more item to be able to gank" (at 20 mins). Thing that happens even if the one ending as a jungler, wasn't the jungler at the start. (last game, a Graves was picked for jungler, but our top Jax kept begging to be allowed in the jungle as he can't play vs Mundo, and at 20 mins, enemy Zac was 2-x-9, while Jax was 1-x-1)

If the myth is indeed true, then what is the difference the system forces?

I understand that one needs to "prove" that they deserve to climb, and that's ok, making the match a bit harder in promos is ok, nothing bad with that, considering we do get a free win if we demote or lose a promo, but then again, what is the difference in elo that the system (if indeed real) forces?

For example, if you're s3 and try to promote to s2, then there's nothing bad with the system having only s3-4 in your team while the enemy team is s2-1, mmr wise, but if promoting from s3 makes your team be on the avg mmr of s4-5, while the enemy team is close to s1-g5, then that may be too much for some players, which making it in even more a luck based thing that skill based, as you need to hope that your other team mates can keep up.

Now, I know the example I gave may be too far fetched in the mmr difference, and no, I don't always lose only because my team mates, as I can have bad games as well, and yes, it may be just bias, but it all promos I had this season (excluding the one from b1 to s5) were much harder than the normal games leading to the promo. I got to s3, got to s2 promos, always losing both, and after the last s2 failed pro I kept losing to demotion to s4, then won 2 in a row to get to promos, losing both promo games by the Jax begging for the jungle, then the other game by having all lanes lost (including mine, but that's not something spectacular when you're 1v3 because the enemy top Riven decided to help Zed as she already got a pair of new gator boots)

I would like to hear your opinions on the matter. [sg-ahri-2]