It's rare that a title winning side has world class players in every position. Indeed it can often be one or two great players added to an already good team that can turn top 4 contenders into title contenders.
Even then in every title winning side there is usually two or three players that fit in, but if they went to a relegation battling side that side would still be battling relegation. They don't make the difference, but nor are they detrimental. I believe Spurs have a few of those sort of players. Too many to be considered a serious threat to the title.
We have Modric & Bale. Those two deserve to be in title winning sides. A few years ago King would've been there too. VDV is excellent, but he lacks something that says to me he deserves to be in a title winning side. This said I feel a bit sorry for VDV because his favoured and best role, as SUIYHA pointed out above, is that of a deep lying forward. Especially in the Premiership, he is not a right winger or central midfielder. If he was played in his natural position week in, week out then maybe I'd perceive him differently.
Ade, Parker, Sandro, Big Brad and Lennon are also very good players but for me lack the quality to be players that can make the difference between 2nd and 1st. The rest? Well they're the sort of players that do well with the above players around them but if you put them in a Wolves or Wigan side those sides would still be battling relegation.