Need clarification Tier 2 Migrant to Tier2 Dependant switch

I have a similar situation

I am on Tier2 ICT(in UK) and my wife is getting Tier2 sponsor ship in december (she is in India).
I am travelling to India during december.

If I apply for dependant visa with my wife and get visa in India, I would like to travel back alone to UK as ICT employee and resign from my current company and serve notice period.
but my wife who is main application wants to travel after 1 month, towards the end of my notice period (during which i will still be on my company sponsorhsip).
1) Can i hold 2 visas ?
2) Can I travel to UK using my current status ( as employee) and then become dependant after my wife arrives towards jan end ?

your dependant visa will supersede the T2 visa and technically as a dependant you are not supposed to travel ahead of the main applicant - depending on how meticulous the border force officer is you may be denied entry