A stand-in is a player a team brings in for a limited period in place of a main player, or for the duration of the search for a permanent one. He is not bought from another organization and not signed for years. He fills a specific hole in the roster: an injury, visa problems, personal circumstances, a bad season, or simply a pause before a big decision. The latest news offers several examples at once, and they show clearly how this mechanism works.
How a stand-in differs from a transfer
A regular transfer is a bet on the future: a contract, a buyout, restructuring tactics around a new person. A stand-in is a bet on the nearest tournament or season. The team does not change its playing model, but looks for a person who fits into it. The other day it became known that VP have a temporary replacement for FOR3VER. The reasons are not named in the source, but the format is obvious: the word "temporary" removes unnecessary expectations from both the player and the organization in advance.
Why they agree on exactly three months
The most illustrative case is the story of Miposhka in Dota 2. According to Korb3n, he agreed right away to join the team only for three months. The coach visited him in February, then in March, and the answer in the end was "yes." The term was stated outright, and this is an important detail: a short agreement lets someone who is not ready to return to permanent work in the pro scene say yes. For the team, the benefit is that an experienced player covers the most critical stretch of the season, while the decision about the permanent roster is postponed.
The same Korb3n said that Miposhka left after winning The International, and that he himself understood this would happen. Here you can see the main property of a stand-in: the departure is built into the deal and is not considered a betrayal or a failure.
Two weeks of fighting with himself
The most instructive part of the story concerns adaptation. According to Korb3n's account, for the first two weeks Yarik fought with himself, and then things "took off." This is not a conclusion about a specific person, but a typical picture for any entry into someone else's system. The newcomer has to learn the team's rules: who calls the tempo, who makes the decision when a lane is lost, how people here criticize and how they praise. At the same time, the main player gets used to having someone beside him with different habits.
In practice, adaptation takes more time than it seems. In three months, two weeks is