Hmm... I never got an answer (but solved it myself a while back).

Recap of the problem:
(1) Three objects (Candidate, Application, Job)
(2) Application is a junction object between Candidate and Job
(3) I needed to be able to select Application records from the Job page, which would take me to Candidate records.
(4) After arriving at the first Candidate record, I needed a "Next" and "Previous" button to go through the list of Candidates (the parents of the Application records I selected).

Anyhoo... incase anyone ever needs to know how to do it, here you go (note that I kept the "Account" language to show the similarity between this modified code and Deepak's original code).

------------------------

Methods Retrieved From:
https://success.salesforce.com/answers?id=90630000000hW5tAAE
https://success.salesforce.com/answers?id=90630000000hiHJAAY
https://developer.salesforce.com/forums/?id=906F00000009ApxIAE
https://www.codecademy.com/en/forum_questions/553685f676b8fe551e000312

Next and Previous Buttons.
Description: Want to go to candidate.
                       List view is on the Job Requisition Object.
                       List view is of applications, which is a child of candidate.
 
Button to get Application record IDs and store to local:

var cycleAccounts = {!GETRECORDIDS( $ObjectType.ts2__Application__c )};

if(cycleAccounts.length >= 1){
   localStorage['CycleAccounts'] = cycleAccounts;
   location.replace('/' + cycleAccounts[0]);
}
 
Next Application Button:

if(localStorage['CycleAccounts']){
var cycleAccounts = localStorage['CycleAccounts'].split(',');
var currentAccountPos = cycleAccounts.indexOf('{!ts2__Application__c.Id}');

if(currentAccountPos == cycleAccounts.length - 1){
alert('This was the Last Application!');
}
else{
location.replace('/' + cycleAccounts[currentAccountPos + 1]);
}
}
 
Previous Application Button:

if(localStorage['CycleAccounts']){
var cycleAccounts = localStorage['CycleAccounts'].split(',');
var currentAccountPos = cycleAccounts.indexOf('{!ts2__Application__c.Id}');

if(currentAccountPos == 0){
alert('This was the First Application!');
}
else{
location.replace('/' + cycleAccounts[currentAccountPos - 1]);
}
}

Button to get Candidate record IDs and store to local:

{!REQUIRESCRIPT("/soap/ajax/30.0/connection.js")} 
{!REQUIRESCRIPT("/soap/ajax/24.0/apex.js")}

var cycleAccounts = new Array();

//required a custom formula field to grab candidate ID (Candidate_ID__c) instead of referencing the lookup field -- don't know why.
var result = {!GETRECORDIDS($ObjectType.ts2__Application__c)}.toString().replace(/,/g , "','"); 
var myquery = "SELECT Id, Candidate_ID__c FROM ts2__Application__c WHERE Id in ('"+result+"')";
var queryResults = sforce.connection.query(myquery);
var records = queryResults.getArray("records");

for (i=0; i < records.length ; i++)
{ 
var child = queryResults.records[i].Candidate_ID__c;

cycleAccounts.push(child);

 }

if(cycleAccounts.length >= 1){
   localStorage['CycleAccounts'] = cycleAccounts;
   location.replace('/' + cycleAccounts[0]);
} 

Next Candidate Button:

if(localStorage['CycleAccounts']){
var cycleAccounts = localStorage['CycleAccounts'].split(',');
var currentAccountPos = cycleAccounts.indexOf('{!Contact.Id}');

if(currentAccountPos == cycleAccounts.length - 1){
alert('This was the Last Application!');
}
else{
location.replace('/' + cycleAccounts[currentAccountPos + 1]);
}
} 

Previous Candidate Button:

if(localStorage['CycleAccounts']){
var cycleAccounts = localStorage['CycleAccounts'].split(',');
var currentAccountPos = cycleAccounts.indexOf('{!Contact.Id}');

if(currentAccountPos == 0){
alert('This was the First Application!');
}
else{
location.replace('/' + cycleAccounts[currentAccountPos - 1]);
}
}