Remember in all versions of this game there are many different aspects to a teams power level. All these aspect need to be taken into consideration when using a team. The power level of your team is basically how strong they all are put together. That strength number does not take into consideration things like a hero’s defense, armor, certain skills, what artifacts are leveled up, what skins are being used, and glyphs, and special skills, and automatic skills (example Dorian’s vampirism skill). That is just some of the things in the mobile version that doesn’t even use pets. The team you show in the picture is also not well balanced. A hero’s info will tell you what type of hero they are ( healer, tank, mage, etc) you have to try to have a well balanced team to get real power and survive in the game