Can you gain stream entry by focusing on the clinging and stress going on at the five clinging aggregates? If I see the clinging and the stress going on at the five clinging aggregates can that propel me into stream entry?

Like say I see that clinging is going on at the five clinging aggregates and I see that it's causing stress can that take me to enlightenment or is another method needed like seeing the rise and fall of the aggregates, or practicing the silavant: http://www.accesstoinsight.org/tipitaka/sn/sn22/sn22.122.than.html sutta.

Is it just a good overall practice anyway?
Yes. Meditating on the five aggregates and seeing the three characteristics of impermanence, stress, and non-self, leads all the way to Arahatship. In the words of the Anattalakhana Sutta:


  "What do you think, monks — Is form constant or inconstant?"
  
  "Inconstant, lord."
  
  "And is that which is inconstant easeful or stressful?"
  
  "Stressful, lord."
  
  "And is it fitting to regard what is inconstant, stressful, subject to
  change as: 'This is mine. This is my self. This is what I am'?"
  
  "No, lord."
  
  (Similarly with the other aggregates)
  
  "Seeing thus, the well-instructed disciple of the noble ones grows
  disenchanted with form, disenchanted with feeling, disenchanted with
  perception, disenchanted with fabrications, disenchanted with
  consciousness. Disenchanted, he becomes dispassionate. Through
  dispassion, he is fully released. With full release, there is the
  knowledge, 'Fully released.' He discerns that 'Birth is ended, the
  holy life fulfilled, the task done. There is nothing further for this
  world.'"
  http://www.accesstoinsight.org/tipitaka/sn/sn22/sn22.059.than.html