A typical system will connect the sync generator pulses and signals to distribution amps. The pulses and signals leave the distribution amps and go on their merry way to the driven equipment. Cables, distribution amps, and connectors all introduce delay, and must be considered in the calculation of path length. Pulse D.A.s, subcarrier D.A.s and video D.A.s do not necessarily have the same delay. Connectors do not introduce much delay, but parallel paths should use similar numbers and types of connectors.
Black burst is the most common single sync signal used in systems today.
All things being equal, there are no timing problems with black burst. But all things ain't equal. Next, video D.A.s which have equalizers, can shift the subcarrier phase relative to the sync phase, so watch them. Third, some devices are built to allow separate sync and subcarrier timing adjustments. Most of these have the individual adjustments to correct for earlier errors, like equalized D.A.s.