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“The “cloud of witnesses” is listed in Hebrews 11.”

Only those from the Old Testament. The cloud of witnesses did not end with the end of the Old Testament age.

As the CCC notes:

A cloud of witnesses

2683 The witnesses who have preceded us into the kingdom,41 especially those whom the Church recognizes as saints, share in the living tradition of prayer by the example of their lives, the transmission of their writings, and their prayer today. They contemplate God, praise him and constantly care for those whom they have left on earth. When they entered into the joy of their Master, they were “put in charge of many things.”42 Their intercession is their most exalted service to God’s plan. We can and should ask them to intercede for us and for the whole world.

2684 In the communion of saints, many and varied spiritualities have been developed throughout the history of the churches. The personal charism of some witnesses to God’s love for men has been handed on, like “the spirit” of Elijah to Elisha and John the Baptist, so that their followers may have a share in this spirit.43 A distinct spirituality can also arise at the point of convergence of liturgical and theological currents, bearing witness to the integration of the faith into a particular human environment and its history. The different schools of Christian spirituality share in the living tradition of prayer and are essential guides for the faithful. In their rich diversity they are refractions of the one pure light of the Holy Spirit.

The Spirit is truly the dwelling of the saints and the saints are for the Spirit a place where he dwells as in his own home since they offer themselves as a dwelling place for God and are called his temple.44

http://biblehub.com/hebrews/12-1.htm

Hebrews 12:1

New International Version
Therefore, since we are surrounded by such a great cloud of witnesses, let us throw off everything that hinders and the sin that so easily entangles. And let us run with perseverance the race marked out for us,