If you are a lone bettor you should always check things first before betting, there are many factors in sports especially during tournaments. Like who are going to play for team A, or who are not going to play for team B. Who are not playing because of injuries. Who are not playing because of sickness. These are the kind of factors that affect your betting, while you can check these things on your own there will be some people, same bettor on the same sports or game that you might want to also check beforehand.
Well for me I'm kind of like an analyzer bettor, I check stats, standings, players, history, etc. before I bet.
Lone or not, checking things first before doing anything is always a must so that we will avoid getting in dangers. If we are in a team, it does not mean that we will now fully depend on them. No that's wrong but as a team, each of you has your own contribution which helps making decision more easier and surer.
Knowing who will play is easy to tell but what is hard is knowing if there will be a player that will get injured or sick but in some games, there are a cashout option available. I guess we can just stop the game early in case unexpected events happened. If not then all we gotta do is pray that the match is still going to be on our favour.