First and foremost Sentinels is a very good team with a good roaster the thing is the lack synergy that other teams have, take prx for example they are fairly new but what out shine is in team synergy even if one goes rouge to get info others try to find value in it while. Sen still waits for call outs and take fights way to early while other team members can't trade him or cover him. One eg is shroud kept planting as the only controller over an over and the opposing team just spammed him down, its too much without a controller for post plant in pro level game plays is very hard. We the hard core sen fans are waiting for sen to polish their knifes and cut their way to top.
If u want this to make more sense it's simple, make a 5 stack (same players) play for 2 months 5 days a week, try mixing up the agent selection. U will reach a point where ur synergy is good that u no need comms 2 know what ur teams is going to do next which sounds stupid but this gives u additional sense of hearing clearly without too much comms even a slight miss foot step, reload, utility noise these will give valuable info to play around force rotation. ( Very well demonstration by prx )