The Welshman has been the best home rider in the race's opening three stages.
The Movistar rider was part of a leading duo for around 25 kilometres on Monday's stage.
The Manxman takes aim at Spanish Grand Tour after finishing second in Sunday's Tour of Britain opener.
JLT-Condor's Richard Handley also expected to join the British squad for 2016.
Details of all of the national tour's eight stages for 2015.
The Manxman says Etixx-Quick Step are unlikely to work to control each stage.
As predicted by CW, the former British road race champion will switch to the fledgling British team next season.
Trek Factory Racing finishes fastest in a chaotic bunch sprint in Lleida; Fabio Aru remains in red.
Race forms part of this year's Herefordshire Festival of Sport - online sportive entries close on Friday.
The Merseysider rode the London 2012 road race and was part of Matrix Fitness' 2015 line-up.