Hmmm... I dunno
I'm just speaking anecdotally (I have no stats to back this up). But I have a few friends who have absolutely ZERO carry capability in any elo (if they get any kind of lead against Bronze, they will literally throw it right back due to lack of game sense)... played 10 games in Ranked and got Silver 3/4 (and this is with them losing about half of those Ranked placements).
And just as expected, they went on IMMEDIATE drop mode in their next dozen game or so until they reach the edge of Silver 5 and quit ranked.
The system is way too generous.
Having to carry out these "paratroopers" is what makes Silver 4/5 so hard. You literally can't tell which team will have these people and it requires you to play way more aggressively/assertively than in Silver 3-1.
The system is really flawed. In fact, even though your title is Bronze I suspect due to regular combat/training in Ranked you play better than many Silver 4 and 5s. Yet they get to play 15 or so games, get placed there, call it quits and "look better" than you. Fair huh?