I doubt pull rod will be copied (nor used by RBR) this year. DDD demands a slim profile ahead of the diffuser, a pull rod set up places the bulky end of the rocker\damper set up in just that area. Perversely a pullrod would suit quick ride height adjustment, as the fixed ends of the torsion bars are at the top of the gear, making adjustment easier. But I doubt that’s enough to warrant its adoption. Pull rod did benefit a low CofG which is hard to achieve at the rear, however with weight distributions moving rearwards this (slimmer front tyres) the higher CofG with pushrod can be offset with low placed ballast.
There’s no doubt that the RB5 was one of the best aero cars last year, it produced lots of efficient downforce, but that doesn’t mean it’s the car to be copied. The RB5 had the low line sidepods, low slung gearbox\differential\crash structure. These were aimed at better rear (beam) wing performance and low CofG. But in fact hampered the DDD, obstructing the onset flow and reducing internal volume. Its surprising that the car did so well with these handicaps.