of Higgsless models, the mass of the heavy Dirac partners of the SM fermions in this model was constrained to lie at $\sim$ 2 TeV, because of the tension between obtaining the correct value for the top-quark mass and keeping $\Delta \rho$ within experimental bounds. To alleviate this constraint, an extension of the three site model was constructed [@Chivukula:2009ck], whose goal was to separate the top-quark mass generation from the rest of electroweak symmetry breaking (EWSB), thus relaxing the aforementioned constraint.

This idea of treating the top-quark mass as arising from a separate dynamics is not new - in fact, Topcolor-assisted technicolor models [@Hill:1991at; @Hill:1994hp; @Lane; @and; @Eichten; @-; @TC2; @Popovic:1998vb; @Hill; @and; @Simmons; @Braam:2007pm] employ precisely this idea. Topcolor-assisted technicolor is a scenario of dynamical electroweak symmetry breaking in which the strong dynamics is partitioned into two different sectors. One sector, the technicolor sector, is responsible for the bulk of electroweak symmetry breaking and is therefore characterized by a scale $F \sim
v$, where $v=$ 246 GeV is the EWSB scale. Consequently, technicolor dynamics is responsible for the majority of gauge boson masses and, more indirectly, light fermion masses. The second strong sector, the topcolor sector, only communicates directly 