Taysom could fill in as a competent third string qb. With his experience he can learn the plays. The coach needs to make a decision, if there is not much difference between the two, chances are you don’t have two Joe Montana’s. Keep one and add value at other positions.
Taysoms been in the league a long time. The team would be better positioned to send one of the young qbs to the practice squad and use the roster spot for another position. Having four qbs on the 53 man roster doesn’t make sense.